1. Suppose that X and Y have a continuous joint distribution for which the joint p.d.f. is as follows: f(x, y) = x+y, for 0≤x≤ 1,0 ≤ y ≤ 1, otherwise. (a) Find E(YX) and Var(YX). (b) If it is

Answer:

B

Step-by-step explanation:

The explanation is attached below.

Thus, the probability of rolling an even number is 3/6 or 1/2.

There are six possible outcomes when rolling a fair six-sided die.

These outcomes are 1, 2, 3, 4, 5, and 6. Three of these outcomes are even numbers, 2, 4, and 6.

Therefore, the probability of rolling an even number is 3/6 or 1/2.

=0.5.

So let me explain to you some concepts related to probability.

When it comes to probability, the number of outcomes is the total number of possible results.

Probability is always a number between 0 and 1. The probability of an event equals the number of ways that the event can occur, divided by the total number of possible outcomes.

A fair six-sided die has six possible outcomes, each of which has the same probability of 1/6. A die can show any number from 1 to 6.

The possible outcomes of rolling a six-sided die are:

1, 2, 3, 4, 5, 6.

Three of these outcomes are even numbers: 2, 4, and 6.

Thus, the probability of rolling an even number is the number of ways that an even number can occur, divided by the total number of possible outcomes.

There are three ways to roll an even number. They are:2, 4, and 6.

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The general solutions to the given differential equations are as follows:

a. For the differential equation yy' = -8 cos(πx), the general solution can be found by separating variables and integrating. After integrating, we obtain the solution y^2/2 = -8 sin(πx)/π + C, where C is the constant of integration.
b. For the differential equation √(1-4x^2)y' = x, we can solve by separating variables and integrating. By integrating, we find √(1-4x^2) = (x^2/2) + C, where C is the constant of integration.


a. To solve the first differential equation yy' = -8 cos(πx), we can separate variables by writing it as ydy = -8 cos(πx)dx. Integrating both sides gives y^2/2 = -8 sin(πx)/π + C, where C is the constant of integration. To find the general solution, we can multiply both sides by 2 and take the square root, yielding y = ±√(-16 sin(πx)/π + 2C).

b. For the differential equation √(1-4x^2)y' = x, we can start by separating variables to obtain √(1-4x^2)dy = xdx. Integrating both sides gives the equation √(1-4x^2) = (x^2/2) + C, where C is the constant of integration. To simplify the equation, we square both sides, which leads to 1-4x^2 = (x^2/2 + C)^2. Solving for y, we get y = ±√[(x^2/2 + C)^2 - 1 + 4x^2]. This represents the general solution to the differential equation.

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To solve the linear system given by x' = Ax, where A is a matrix with a repeated eigenvalue, we can express the solution in different forms.

A. In eigenvalue-eigenvector form:

The eigenvalue is 3, and the eigenvector associated with it is represented as v. So, the solution can be written as x(t) = e^(3t)v.

B. In fundamental matrix form:

The fundamental matrix is constructed using the eigenvectors and generalized eigenvectors. In this case, the fundamental matrix is:

[x(t)] [4e^(3t) 3+4t] [c1]

[y(t)] = [2e^(3t)] * [ 1 ] * [c2]

C. As two equations:

Another way to represent the solution is by writing it as two separate equations:

x(t) = 4e^(3t)(c1 + c2(3/4 + t))

y(t) = 2e^(3t)(c1 + c2(1))

Here, c1 and c2 are constants that depend on the initial conditions of the system.

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a) The adults do not do banking online = 70%. b)  15% mentioned above is joint probability.  c) marginal probabilities are calculated. d) The probability that an individual conducts banking online under the age of 50 is 25%. e) No, Banking online and Age are not independent variables.

a) Let's consider that we have 100 adults in total.

According to the survey, 30 % of them do banking online.

Then, the rest of the adults do not do banking online:100 - 30 = 70, which is 70 % of the adults.

b)  15% mentioned above is joint probability.

Joint probability is the probability of two or more events happening together. The event of conducting banking online and being under the age of 50 are happening together.

c) Construct a contingency table showing all joint and marginal probabilities.

The row represents age, and the column represents the choice of banking. Joint probabilities are filled in the cells, and marginal probabilities are calculated.

d) The probability that an individual conducts banking online given that the individual is under the age of 50 is 0.25 or 25%.

We need to find P(Online Banking | Under 50)

P(Online Banking | Under 50) = P(Online Banking and Under 50) / P(Under 50)P(Online Banking | Under 50) = 0.15 / 0.6 = 0.25 or 25%

e) No, Banking online and Age are not independent variables

If two events are independent, then the occurrence of one event does not affect the probability of the occurrence of the other event.

But, if two events are dependent, then the occurrence of one event affects the probability of the occurrence of the other event.

Here, Age and Online Banking are dependent variables. The occurrence of one event (Age) affects the probability of the occurrence of the other event (Online Banking).

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The slope of the line passing through (4,8) and (-2,4) is 6/6 = 1. So, the slope of the line passing through (5,4) and parallel to the first line is also 1. The equation of the line in slope-intercept form is y = mx + b, where m is the slope and b is the y-intercept.

We know that m = 1, so we can plug that into the equation to get y = 1x + b. We can then plug the point (5,4) into the equation to solve for b. When we do this, we get 4 = 1(5) + b. Solving for b, we get b = -1. Therefore, the equation of the line passing through (5,4) and parallel to the line passing through (4,8) and (-2,4) is y = x - 1.

Find the line of least-squares fit for the given data points. What is the correlation coefficient? Plot the data and graph the line. (-4,6), (1,2), (6,-3). The line of least-squares fit for the given data points is y = -3.6x + 7.6. The correlation coefficient is -0.84. To find the line of least-squares fit, we can use the following formula:

y = ax + b

where a and b are the slope and y-intercept of the line, respectively. We can find a and b by using the following formulas:

a = (∑xy - ∑x∑y) / (∑x^2 - ∑x)^2

b = (∑y - a∑x) / ∑x^2 - ∑x

where ∑ indicates the sum of the values, and x and y are the x-coordinates and y-coordinates of the data points, respectively. Plugging in the values of the data points, we get the following values for a and b:

a = (6 - (-4)(2) - 3(1)(6)) / (6^2 - (-4)^2) = -3.6

b = (2 - (-3.6)(-4) - 3(1)(6)) / 6^2 - (-4)^2 = 7.6

Plugging in these values of a and b into the equation for the line of least-squares fit, we get the following equation:

y = -3.6x + 7.6

The correlation coefficient is a measure of the strength of the linear relationship between the x-coordinates and y-coordinates of the data points. The correlation coefficient can range from -1 to 1. A correlation coefficient of -1 indicates a perfect negative linear relationship, a correlation coefficient of 0 indicates no linear relationship, and a correlation coefficient of 1 indicates a perfect positive linear relationship. The correlation coefficient for the given data points is -0.84, which indicates a strong negative linear relationship.

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To determine which statements are true regarding the function f(x) = -5(x-4)(x + 7), we need to analyze the behavior of the function as x approaches positive or negative infinity.

Evaluate the function at specific values. a) As x approaches negative infinity (x → -∞), the function f(x) can be analyzed by considering the behavior of the leading term, -5(x-4)(x + 7). As x becomes increasingly negative, both (x-4) and (x + 7) will tend to negative infinity, resulting in a positive value for f(x). Therefore, the statement "As x → -∞, f(x) → 8x" is false. b) As x approaches positive infinity (x → +∞), the function f(x) can be analyzed in a similar manner. Both (x-4) and (x + 7) will tend to positive infinity as x becomes increasingly large, resulting in a negative value for f(x). Hence, the statement "As x → +∞, f(x) → +∞" is false.

c) As x approaches negative infinity (x → -∞), the function f(x) can be analyzed by considering the behavior of the leading term, -5(x-4)(x + 7). Both (x-4) and (x + 7) will tend to negative infinity as x becomes increasingly negative, resulting in a positive value for f(x). Therefore, the statement "As x → -∞, f(x) → -∞" is false. d) The statement "As x → +∞, f(x) → +∞" indicates that as x approaches positive infinity, the function f(x) also tends to positive infinity. However, since the leading term of f(x) is -5(x-4)(x + 7), the function will tend to negative infinity as x approaches positive infinity. Thus, the statement "As x → +∞, f(x) → +∞" is false.

In summary, none of the given statements are true for the function f(x) = -5(x-4)(x + 7). The correct behavior of the function is that as x approaches negative infinity, f(x) tends to a positive value, and as x approaches positive infinity, f(x) tends to negative infinity.

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(a) The estimator B = -1/X₁Σ(Y₂²) is unbiased for B.

(b) To evaluate if the estimator Σ(*) B is BLUE, more information is needed about other unbiased estimators and their variances.

(a) To determine if the estimator B = -1/X₁Σ(Y₂²) is unbiased for B, we need to calculate E[B|X].

First, let's derive the expression for E[B|X]:

E[B|X] = E[-1/X₁Σ(Y₂²)]

       = -1/X₁ΣE(Y₂²)

Since Y₂ is the dependent variable in the regression model, we can express it as:

Y₂ = B₀ + B₁X + ε

Taking the expectation of Y₂²:

E(Y₂²) = E[(B₀ + B₁X + ε)²]

       = E[B₀² + 2B₀B₁X + B₁²X² + 2B₀ε + 2B₁Xε + ε²]

       = B₀² + 2B₀B₁E(X) + B₁²E(X²) + 2B₀E(ε) + 2B₁XE(ε) + E(ε²)

       = B₀² + B₁²E(X²) + E(ε²)

Since E(X) = 0 and E(ε) = 0, the expression simplifies to:

E(Y₂²) = B₀² + B₁²E(X²) + E(ε²)

Substituting this back into the expression for E[B|X]:

E[B|X] = -1/X₁Σ(B₀² + B₁²E(X²) + E(ε²))

       = -1/X₁Σ(B₀² + B₁²E(X²) + Var(ε))

       = -1/X₁Σ(B₀² + B₁²E(X²) + σ²)  (since Var(ε) = σ²)

Now, we can determine if E[B|X] equals B to determine if the estimator B = -1/X₁Σ(Y₂²) is unbiased for B. If E[B|X] = B, then the estimator is unbiased.

(b) The proposed unbiased estimator Σ(*) B can be obtained by summing the individual estimates for B from each observation in the sample.

To determine if this estimator is BLUE (Best Linear Unbiased Estimator), we need to check if it satisfies the properties of linearity, unbiasedness, and minimum variance among all unbiased estimators.

- Linearity: The estimator Σ(*) B is linear since it is obtained by summing the individual estimates.

- Unbiasedness: The estimator is unbiased if the expected value of the estimator equals the true parameter value. We need to calculate E[Σ(*) B] and check if it equals B.

- Minimum variance: To establish minimum variance, we need to compare the variance of the estimator Σ(*) B with the variances of other unbiased estimators and determine if it has the smallest variance among them.

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Answer:

[tex]0.186[/tex]

Step-by-step explanation:

[tex]\mathrm{Solution,}\\\mathrm{Suppose\ getting\ head\ is\ a\ success\ and\ getting\ tail\ is\ a\ failure.}\\\mathrm{Now,}\\\mathrm{Probability\ of\ success(p)=0.45}\\\mathrm{Probability\ of\ failure(q)=1-p=1-0.45=0.55}\\\mathrm{Number\ of\ times\ experiment\ is\ done(n)=6}\\\mathrm{Number\ of\ success\ desired(r)=4}\\\mathrm{We\ use\ the\ formula,}\\\mathrm{P(r)=nCr\times p^r\times q^{n-r}}\\\mathrm{P(4)=6C4\times 0.45^4\times 0.55^{6-4}}=0.186}[/tex]

[tex]\mathrm{So,\ the\ required\ probability\ is\ 0.186.}[/tex]

Answer:

548.8 joules!

as y approaches 0, the limit is 0.

To evaluate the limit as y approaches 0 of (arctan(y) - sin(y))/(y^3 * cos(y)), we can use the Taylor series expansions of the functions involved. Thus, we can evaluate the limit by identifying the coefficient of the highest power of y in the resulting series.

To evaluate the limit as y approaches 0 of (arctan(y) - sin(y))/(y^3 * cos(y)), we can expand the functions arctan(y), sin(y), and cos(y) using their Taylor series expansions. The Taylor series expansion for arctan(y) is y - (y^3)/3 + (y^5)/5 - ..., the expansion for sin(y) is y - (y^3)/6 + (y^5)/120 - ..., and the expansion for cos(y) is 1 - (y^2)/2 + (y^4)/24 - .... By substituting these series expansions into the given expression, we get:

[(y - (y^3)/3 + (y^5)/5 - ...) - (y - (y^3)/6 + (y^5)/120 - ...)] / [(y^3 * (1 - (y^2)/2 + (y^4)/24 - ...))]

Simplifying the expression, we get:

[(2y^3)/3 + O(y^5)] / [(y^3 - (y^5)/2 + O(y^7))]

Here, O(y^n) represents terms of higher order than y^n. We can neglect these terms as y approaches 0. The leading term in the simplified expression is (2y^3)/3. Therefore, as y approaches 0, the limit is 0.

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The interpretation is that we are 90% confident that the true difference in the mean daily leisure time between adults with no children and adults with children lies between 0.451 and 2.109 hours.

The given data are: For adults with no children under the age of 18 years, Mean = 5.65 hours Standard deviation = 2.43 hours Sample size, n1 = 40 For adults with children under the age of 18, Mean = 4.37 hours Standard deviation = 1.73 hours Sample size, n2 = 40 The formula to calculate the 90% confidence interval for the difference between two means can be given as:\[\left( {{\bar x}_1} - {{\bar x}_2} \right) \pm {t_{\frac{\alpha }{2},n_1 + {n_2} - 2}}\sqrt {\frac{{s_1^2}}{n_1} + \frac{{s_2^2}}{n_2}}\]where,${{\bar x}_1}$ is the sample mean for group 1,${{\bar x}_2}$ is the sample mean for group 2,${{s_1}}$ is the sample standard deviation for group 1,${{s_2}}$ is the sample standard deviation for group 2,$\alpha$ is the level of significance,$n_1$ is the sample size for group 1,$n_2$ is the sample size for group 2,and $t_{\frac{\alpha }{2},n_1 + {n_2} - 2}$ is the t-value from the t-distribution with (n1 + n2 – 2) degrees of freedom.

Let's calculate the confidence interval as follows: Mean difference, $\left( {{\bar x}_1} - {{\bar x}_2} \right)$= 5.65 − 4.37= 1.28 hours Sample standard deviation for group 1, ${s_1}$ = 2.43 hours Sample standard deviation for group 2, ${s_2}$ = 1.73 hours Sample size for group 1, ${n_1}$ = 40Sample size for group 2, ${n_2}$ = 40 Degree of freedom = $n_1 + n_2 - 2$= 40 + 40 – 2= 78$\alpha$ = 0.1 (90% confidence interval, $\alpha$ = 1 – 0.9 = 0.1)Using the t-table or calculator with the given values, we get:$t_{\frac{\alpha }{2},n_1 + {n_2} - 2}$ = t0.05, 78 = 1.665 (approximately)Substituting the given values in the formula, we get:\[\left( {{\bar x}_1} - {{\bar x}_2} \right) \pm {t_{\frac{\alpha }{2},n_1 + {n_2} - 2}}\sqrt {\frac{{s_1^2}}{n_1} + \frac{{s_2^2}}{n_2}}\] = $1.28 \pm 1.665\sqrt {\frac{{2.43^2}}{40} + \frac{{1.73^2}}{40}}$= $1.28 \pm 0.829$= (0.451, 2.109)

Therefore, the 90% confidence interval for the mean difference in leisure time between adults with no children and adults with children is (0.451, 2.109) hours.

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We can also say that adults with no children have, on average, between 0.50 hours and 2.06 hours more leisure time per day than adults with children under the age of 18.

The 90% confidence interval for the mean difference in leisure time between adults with no children and adults with children is (-1.23, -0.04).

We are to construct a 90% confidence interval for the mean difference in leisure time between adults with no children and adults with children.

We are given the following information:

u1 = mean daily leisure time of adults with no children

= 5.65 hours

σ1 = standard deviation of daily leisure time of adults with no children

= 2.43 hours

n1 = sample size of adults with no children

= 40

u2 = mean daily leisure time of adults with children

= 4.37 hours

σ2 = standard deviation of daily leisure time of adults with children

= 1.73 hours

n2 = sample size of adults with children

= 40

We can find the standard error (SE) of the difference in means as follows:

SE = sqrt [ (σ1^2 / n1) + (σ2^2 / n2) ]

SE = sqrt [ (2.43^2 / 40) + (1.73^2 / 40) ]

SE = sqrt (0.1482 + 0.0752)

SE = sqrt (0.2234)

SE = 0.4726

We can now use the formula for a confidence interval of the difference in means as follows:

CI = ( (u1 - u2) - E , (u1 - u2) + E )

where

E = z*SE and z* is the z-score for the level of confidence.

Since we want a 90% confidence interval, we look for the z-score that corresponds to the middle 90% of the normal distribution, which is found using a z-table or calculator.

For a 90% confidence level, the z* value is 1.645,

so:E = 1.645 * 0.4726E = 0.7779

Plugging in the values, we have:CI = ( (5.65 - 4.37) - 0.7779 , (5.65 - 4.37) + 0.7779 )CI = ( 1.28 - 0.78, 1.28 + 0.78 )CI = ( 0.50, 2.06 )

The 90% confidence interval for the mean difference in leisure time between adults with no children and adults with children is (0.50, 2.06).

This means that we are 90% confident that the true mean difference in leisure time between the two groups of adults falls between 0.50 hours and 2.06 hours.

Since the interval does not include zero, we can conclude that the difference in means is statistically significant at the 0.10 level. We can also say that adults with no children have, on average, between 0.50 hours and 2.06 hours more leisure time per day than adults with children under the age of 18.

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The overall Type I error probability would be approximately 0.0396 or 3.96%.

To determine the overall Type I error probability when performing multiple paired t-tests across 4 different categories, we need to consider the concept of familywise error rate (FWER). The FWER is the probability of making at least one Type I error among all the tests conducted.

In this case, we are conducting 4 paired t-tests, each with a significance level of α = 0.01. The Type I error rate for each individual test is α = 0.01.

To calculate the overall Type I error probability, we use the formula for FWER:

Overall Type I error probability = 1 - (1 - α)^k

Where k is the number of tests conducted.

In this scenario, k = 4 (since we are performing 4 paired t-tests). Substituting the values into the formula, we have:

Overall Type I error probability = 1 - (1 - 0.01)^4 = 1 - 0.99^4 ≈ 0.0396

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$985.86

Interest is the amount earned on an initial investment.

Compound Interest

The question asks us to find the amount of money in an account after 10 years of earning interest. Additionally, the question states that the interest is compounded semiannually. Compound interest is the amount earned on the initial investment and the interest already earned. Remember that semiannually means twice a year. Also, it's important to know that the initial investment is often referred to as principal.

Interest Formula

In order to calculate compound interest we can use the following formula:

In this formula, P is the principal, r is the interest rate as a decimal, n is the number of times compounded per year, and t is the time in years. So, to solve this, all we need to do is plug in the information we already know.

This means that after 10 years, the balance will be $985.86.

The CDF for the random variable Y is F(y) = y² + y for 0 ≤ y ≤ 1.

The probability that Y is greater than 0.5 is 0.25.

The expected value (mean) of Y is 7/6 and the variance of Y is -1/36.

We have,

Calculate the cumulative distribution function (CDF) for the random variable Y.

The cumulative distribution function (CDF), denoted as F(y), represents the probability that the random variable Y takes on a value less than or equal to y.

For the given pdf, we can calculate the CDF as follows:

F(y) = ∫[0, y] (2t + 1) dt

To find the integral, we integrate the expression (2t + 1) with respect to t from 0 to y.

Simplifying the integral gives us:

F(y) = [t² + t] evaluated from 0 to y

= (y² + y) - (0² + 0)

= y² + y

Therefore, the CDF for the random variable Y is F(y) = y² + y for 0 ≤ y ≤ 1.

Determine the probability that Y is greater than 0.5.

To find the probability that Y is greater than 0.5, we can use the CDF:

P(Y > 0.5) = 1 - P(Y ≤ 0.5)

= 1 - F(0.5)

= 1 - (0.5² + 0.5)

= 1 - 0.25 - 0.5

= 0.25

Therefore, the probability that Y is greater than 0.5 is 0.25.

Find the expected value (mean) and variance of the random variable Y.

The expected value (mean) of a random variable Y can be calculated using the formula:

E(Y) = ∫[0, 1] y x (2y + 1) dy

Integrating the expression y x (2y + 1) gives us:

E(Y) = ∫[0, 1] (2y² + y) dy

= [2/3 x y³ + 1/2 x y²] evaluated from 0 to 1

= (2/3 x 1³ + 1/2 x 1²) - (2/3 x 0³ + 1/2 x 0²)

= 2/3 + 1/2

= 7/6

Therefore, the expected value (mean) of the random variable Y is E(Y) = 7/6.

To calculate the variance of the random variable Y, we can use the formula:

Var(Y) = E(Y²) - [E(Y)]²

The term E(Y²) can be found by evaluating the integral:

E(Y^2) = ∫[0, 1] y² x (2y + 1) dy

Integrating y² x (2y + 1) gives us:

E(Y²) = ∫[0, 1] (2y³ + y²) dy

[tex]= 1/2 \times y^4 + 1/3 \times y^3[/tex]

evaluated from 0 to 1

[tex]= (1/2 * 1^4 + 1/3 * 1^3) - (1/2 * 0^4 + 1/3 * 0^3)[/tex]

= 1/2 + 1/3

= 5/6

Substituting these values into the variance formula:

[tex]Var(Y) = E(Y^2) - [E(Y)]^2[/tex]

= 5/6 - (7/6)²

= 5/6 - 49/36

= -1/36

Therefore, the variance of the random variable Y is Var(Y) = -1/36.

Thus,

The CDF for the random variable Y is F(y) = y² + y for 0 ≤ y ≤ 1.

The probability that Y is greater than 0.5 is 0.25.

The expected value (mean) of Y is 7/6 and the variance of Y is -1/36.

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The complete question:

Let Y₁, Y₂, Y₃ be a random sample from a probability density function (pdf) given by:

Find the probability that Y is greater than 0.5.

Find the CDF of the random variable.

f(y) = (2y + 1), for 0 ≤ y ≤ 1

Find the expected value and variance of Y.

The solution for x of expression cos⁻¹ x = - π/2 - 2 sin⁻¹ (√2/2) is,

⇒ x = - 1

We have to given that,

Expression to solve,

⇒ cos⁻¹ x = - π/2 - 2 sin⁻¹ (√2/2)

Now, We can simplify the expression for x,

⇒ cos⁻¹ x = - π/2 - 2 sin⁻¹ (√2/2)

⇒ cos⁻¹ x = - π/2 - 2 sin⁻¹ (1/√2)

⇒ cos⁻¹ x = - π/2 - 2 sin⁻¹ (sin π/4)

⇒ cos⁻¹ x = - π/2 - 2 × π/4

⇒ cos⁻¹ x = - π/2 - π/2

⇒ cos⁻¹ x = - π

⇒ x = cos (- π)

⇒ x = cos π

⇒ x = - 1

Therefore, The solution for x of expression cos⁻¹ x = - π/2 - 2 sin⁻¹ (√2/2) is,

⇒ x = - 1

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The problem requires us to evaluate the sum, difference, and product of two functions, f(x) = x² - 4x and g(x) = x + 13, as well as the difference between the two functions. We need to find the values of these expressions at a specific input, which is -2 in this case.

a. To find (f+g)(-2), we substitute -2 into both functions and add the results.

  (f+g)(-2) = f(-2) + g(-2) = ((-2)² - 4(-2)) + (-2 + 13) = (4 + 8) + 11 = 12 + 11 = 23.

b. To find (f-g)(-2), we substitute -2 into both functions and subtract the results.

  (f-g)(-2) = f(-2) - g(-2) = ((-2)² - 4(-2)) - (-2 + 13) = (4 + 8) - 11 = 12 - 11 = 1.

c. To find f(x) - g(x), we subtract the second function from the first function without substituting a specific value.

  f(x) - g(x) = (x² - 4x) - (x + 13) = x² - 4x - x - 13 = x² - 5x - 13.

Therefore, the results are:

a. (f+g)(-2) = 23

b. (f-g)(-2) = 1

c. f(x) - g(x) = x² - 5x - 13.

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Ted can clear a football field in 3 hours, while Jacob can clear it in 2 hours. When they work together, the time it takes to clear the field can be determined by solving the equation 1/3 + 1/2 = 1/t.

Let's consider the equation 1/3 + 1/2 = 1/t, where t represents the number of hours it would take Ted and Jacob to clear the field together. To solve for t, we need to find a common denominator for the fractions on the left-hand side. The least common multiple (LCM) of 3 and 2 is 6.

By multiplying the first fraction by 2/2 and the second fraction by 3/3, we can rewrite the equation as (2/6) + (3/6) = 1/t. This simplifies to 5/6 = 1/t.

To isolate t, we can take the reciprocal of both sides, giving us t/1 = 6/5. Cross-multiplying, we find t = 6/5 = 1.2.

Therefore, it will take Ted and Jacob 1.2 hours (or 1 hour and 12 minutes) to clear the football field together.

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Given that the distance of fly balls hit to the outfield follows a normal distribution with a mean of 264 feet (μ = 264) and a standard deviation of 43 feet (σ = 43).

we can denote X as the random variable representing the distance in feet for a fly ball.

Therefore, we can express this mathematically as:

X ~ N(264, 43^2)

This notation indicates that X is normally distributed with a mean of 264 and a variance of 43^2.

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The number of possible states for the windows in the house can be determined by considering the options for each window.

Since each window can be either open, ajar, or closed, there are three possibilities for each window. Therefore, to find the total number of possible states, we multiply the number of possibilities for each window together.

Since there are five windows in the house, we multiply the number of possibilities (3) by itself five times: 3 × 3 × 3 × 3 × 3 = 243.

Hence, there are 243 possible states for the windows in the house. This means that the windows can be arranged in 243 different combinations of open, ajar, and closed states. Each state represents a unique configuration of the windows, and the total number of states reflects the variety of possible arrangements.

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To find the variance of the random variable X, which represents the number of females in a committee of two individuals randomly selected from a human population where 20% are female, we can use the binomial distribution.

The variance of a binomial distribution is given by the formula Var(X) = np(1 - p), where n is the number of trials and p is the probability of success.

In this case, n = 2 (as we are selecting a committee of two individuals) and p = 0.2 (as the probability of selecting a female is 20%).

Therefore, the variance of X is Var(X) = 2 * 0.2 * (1 - 0.2) = 0.32.

Hence, the variance of the random variable X is 0.32.

For the second part of the question, let's consider the random variable X, which represents the total sum of the numbers observed on two cards randomly selected with replacement from a box containing 100 cards (40 labeled with 5 and the rest labeled with 10).

To find P(X > 10), we need to calculate the probability of getting a sum greater than 10.

Let's consider the possible outcomes when selecting two cards:

Both cards are labeled 5: The sum is 5 + 5 = 10.

One card is labeled 5 and the other is labeled 10: The sum is 5 + 10 = 15.

Both cards are labeled 10: The sum is 10 + 10 = 20.

We are interested in the probability of getting a sum greater than 10, which is P(X > 10). In this case, only one outcome satisfies this condition, which is when the sum is 15.

Since the cards are selected with replacement, each selection is independent, and the probabilities can be multiplied together. The probability of selecting a card labeled 5 is 40/100 = 0.4, and the probability of selecting a card labeled 10 is 60/100 = 0.6.

Therefore, P(X > 10) = P(X = 15) = P(5 and 10) + P(10 and 5) = (0.4 * 0.6) + (0.6 * 0.4) = 0.24 + 0.24 = 0.48.

Hence, the probability that the sum of the numbers observed on the two cards is greater than 10 is 0.48.

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The probability of 8 successes in the n independent trials of the experiment is 0.2816

There are n independent trials in a binomial experiment.

There are only two outcomes of interest in each trial. These outcomes are usually referred to as success and failure.There is a fixed probability of success on each trial.

This probability is denoted by p. The probability of failure is denoted by q, which is 1 - p.

Also, the probability of success remains the same in each trial.

The probability of x successes in the n independent trials of the experiment is given by the binomial distribution formula:P(x) = (nCx) * p^x * q^(n-x)Where nCx is the number of ways to choose x items from n items.To find the probability of 8 successes in the n independent trials of the experiment, we use the above formula:P(8) = (10C8) * (0.75)^8 * (0.25)^2= (45) * (0.1001) * (0.0625)= 0.2816

Therefore, the probability of 8 successes in the n independent trials of the experiment is 0.2816.

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Given that G(x) = 22 - 25(5 - x) + x - 3. As a approaches 5, the quotient gives an indeterminate form of the type 0/0.Hence, the correct answer is O 0/0.

Now, we need to find as x approaches 5, the quotient gives an indeterminate form of the type.

O 1[infinity]O [infinity]0/0O 0/0O [infinity]/[infinity]O

[infinity]-[infinity]

Now, we will solve it:

G(x) = 22 - 25(5 - x) + x - 3

= 22 - 125 + 25x + x - 3

= 5x - 106

Now, using the given function G(x), we need to find the limit of G(x) as x approaches 5.Let x approach 5, thenG(x)

= 5(5) - 106

= 25 - 106

= -81.

Therefore, as a approaches 5, the quotient gives an indeterminate form of the type 0/0.Hence, the correct answer is O 0/0.

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The total interest earned for the year was $1480, The amount invested at 4% is $10,000.

Let's assume the amount invested at 4% is x dollars. Since the total investment is $25,000, the amount invested at 7% would be (25,000 - x) dollars.

To calculate the total interest earned for the year, we can use the formula: Total Interest = Interest from 4% Account + Interest from 7% Account.

The interest earned from the 4% account is given by: 0.04x.

The interest earned from the 7% account is given by: 0.07(25,000 - x).

According to the problem, the total interest earned is $1480. So we can set up the equation: 0.04x + 0.07(25,000 - x) = 1480

Simplifying the equation:

0.04x + 1750 - 0.07x = 1480

-0.03x = 1480 - 1750

-0.03x = -270

x = (-270)/(-0.03)

x = 9000

Therefore, the amount invested at 4% is $9,000, and the amount invested at 7% is $25,000 - $9,000 = $16,000.

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A random sample of 1,018 U.S. adults was surveyed to investigate the proportion of adults who own their primary residence. The answers to the following questions will help us analyze the data and draw conclusions.

(a) The observational unit in this study is the individual U.S. adult.

(b) The variable of interest is homeownership status, which is categorical, as it divides respondents into two distinct groups: homeowners and non-homeowners.

(c) The parameter of interest is the proportion of all U.S. adults who own their primary residence. We can represent this parameter using the symbol p.

(d) The null hypothesis (H0) states that the proportion of U.S. adults who own their primary residence is equal to 50%, while the alternative hypothesis (Ha) states that the proportion is greater than 50%.

(e) It is valid to calculate a normal-approximation based p-value because the sample size (1,018) is sufficiently large. According to the Central Limit Theorem, the sampling distribution of the proportion will be approximately normal.

(f) To calculate the normal-approximation based p-value, we can use a one-sample proportion z-test. The test statistic is calculated as (p - p0) / [tex]\sqrt{(p0(1-p0)/n)}[/tex], where p is the sample proportion, p0 is the proportion under the null hypothesis, and n is the sample size. With the given data, we can calculate the p-value using the test statistic and determine if it is statistically significant.

g) Based on the calculated p-value, we can draw a conclusion. If the p-value is less than the significance level (e.g., 0.05), we reject the null hypothesis and conclude that a majority of U.S. adults own their primary residence. If the p-value is greater than or equal to the significance level, we fail to reject the null hypothesis and do not have sufficient evidence to conclude that a majority of U.S. adults own their primary residence.

(h) Using Gallup's data, we can estimate the proportion of all U.S. adults who own their primary residence with a 95% confidence interval. By calculating the confidence interval using the sample proportion and the margin of error, we can state, with 95% confidence, the range in which the true population proportion lies. This interval provides a range of plausible values for the parameter and allows us to interpret the estimate in the context of the study.

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The triangle is solved and the sides and angles are rounded to three significant figures as follows.a = 9.9 cmb = 26.0 cmc = 20.9 cmA = 20.8°B = 65.5°C = 94.2°. A triangle can be solved by using the law of sines and the law of cosines to solve for missing sides and angles.

In a triangle ABC, let angle A be opposite side a, angle B be opposite side b, and angle C be opposite side c. Also, let the values of sides a, b, and c be known. The triangle can be solved for missing sides and angles by using the following equations.1. Law of Sines:a/sinA = b/sinB = c/sinC2. Law of Cosines:a² = b² + c² - 2bc cos A ; solve for a (two possible solutions) b² = a² + c² - 2ac cos B ; solve for b (two possible solutions) c² = a² + b² - 2ab cos C ; solve for c (two possible solutions)

Given the triangle with a, b, and c opposite angles A, B, and C respectively.Since we know that the sum of all angles in a triangle is 180°, we can find the measure of angle A using the following formula.A + B + C = 180°Substituting the known values, we haveA + 82.7° + 76.5° = 180°A = 180° - 82.7° - 76.5°A = 20.8°Therefore, the measure of angle A is 20.8°.To

⇒ b/sin(65.5°) = 20.9/sin(38°)b = (sin 65.5°/sin 38°) * 20.9b = 26.0 cm

Therefore, the length of side b is 26.0 cm.To find the length of side a, we can use the law of cosines.2bc cos A = b² + c² - a²2(20.9)(12.4) cos 20.8° = 26.0² + 20.9² - a²519.68 cos 20.8° = 1359.21 - a²a² = 1359.21 - 519.68  To check the values, we can verify that the sum of all angles in the triangle is 180°.A + B + C = 20.8° + 65.5° + 94.2° = 180.5°Therefore, the triangle is solved and the sides and angles are rounded to three significant figures as follows.a = 9.9 cmb = 26.0 cmc = 20.9 cmA = 20.8°B = 65.5°C = 94.2°

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The differential equation is of the formd²y/dt² + 35y/12 = 0, with the initial conditions y(0) = 2 and y(1) = 5. Firstly, find the roots of the characteristic equation.

The characteristic equation for the differential equation is m² + (35/12) = 0.

On solving the equation, we get m₁ = -√35i/2 and m₂ = √35i/2.

The general solution of the differential equation is y = C₁ sin (kx) + C₂ cos (kx), where k = (35/12)¹/².

The given initial condition is y(0) = 2

This gives2 = C₂.... (1) Using the second initial condition y(1) = 5,y = C₁ sin (kx) + C₂ cos (kx)

Applying the boundary condition, we get 5 = C₁ sin k + C₂ cos k.... (2)

Using equations (1) and (2), we can solve for C₁ and C₂.

C₁ = (5 - 2cos k)/sin k and C₂ = 2.

Substituting the values of C₁ and C₂ in the general solution of the differential equation,

y = (5 - 2 cos k) / sin k * sin k + 2 cos k

We can simplify the expression to obtain y = 2 cos k + 5/ sin k

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The sum of the first four terms of the given geometric sequence is 40.

To find the sum of the first four terms of a geometric sequence with a first term (a₁) of -1 and a common ratio (r) of 3, we can use the formula for the sum of a finite geometric series:

S₄ = a₁ * (1 - r⁴) / (1 - r),

where S₄ represents the sum of the first four terms.

Substituting the given values into the formula, we have:

S₄ = -1 * (1 - 3⁴) / (1 - 3).

Calculating the numerator and denominator separately:

Numerator:

1 - 3⁴ = 1 - 81 = -80.

Denominator:

1 - 3 = -2.

Now, substituting the numerator and denominator back into the formula:

S₄ = -1 * (-80) / (-2) = 80 / 2 = 40.

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The exponential function that models the company's annual profit, t years from 2010, is:

P(t) = 93000(1.13[tex])^t[/tex]

To write an exponential function that models the company's annual profit, we can use the given information that the profit has grown by 113% per year since 2010.

Let's denote the annual profit at time t years from 2010 as P(t).

Since the profit has grown by 113% per year, it means the profit at each year is 1.13 times the profit of the previous year.

Then we can write the exponential function as:

P(t) = 93000(1.13[tex])^t[/tex]

Here, 93000 represents the initial profit in 2010, and[tex](1.13)^t[/tex] represents the growth factor of 113% per year, raised to the power of t years.

Thus, the exponential function that models the company's annual profit, t years from 2010, is:

P(t) = 93000(1.13[tex])^t[/tex]

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