It would be more efficient to take the new road from Crimson to Sunshine to get home.
To determine the shortest route home, we can use the Pythagorean theorem, which states that in a right-angled triangle, the square of the length of the hypotenuse (the side opposite the right angle) is equal to the sum of the squares of the other two sides. In this case, the two sides are the distances you traveled west (6 miles) and south (8 miles).
Using the Pythagorean theorem, we have:
Hypotenuse² = 6² + 8²
Hypotenuse² = 36 + 64
Hypotenuse² = 100
Hypotenuse = √100 = 10 miles
So, the shortest route home (the new road) is 10 miles. If you go back the way you came, you would travel 6 miles west and then 8 miles north, for a total of 14 miles. The longer route (14 miles) is 4 miles longer than the shorter route (10 miles). Therefore, you should take the new road to get home more quickly.
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19. The functions f and g are defined by f(x) = 2x/x-2 and g(x) = x + 4 respectively. Find
gf.
Answer:
gf(x) = g(f(x)) = (x+4)(2x/x-2) = 2x^2 + 8x - 8
Answer the question in the photo
Check the picture below.
Your current CD matures in a few days. You would like to find an investment with a higher rate of return than the CD. Stocks historically have a rate of return between 10% and 12%, but you do not like the risk involved. You have been looking at bond listings in the newspaper. A friend wants you to look at the following corporate bonds as a possible investment. Bond Cur. Yld. Vol Close Net Chg. 7. 5 128 3 ABC 7-15 104- 2 4 8. 4 17 XYZ 7- 15 100- 2 1 3 1 1 +- 4 4 What price would you pay for each bond if you purchased one of them today? (Remember the face value is $1000) а. ABC: $1047. 50 XYZ. $1,005. 00 b ABC $1104. 75 XYZ: $1100. 50 ABC: $872 XYZ. $983 d. ABC: $750 XYZ: $840 C. â
Note that the price to be paid for each bond if they are purchased today a.
ABC: $1047.50
XYZ: $1005.00 (Option A)
How is this so ?The formula to determine the price to pay for a bond, is ...
Price = (Annual Interest Payment) / (Current Yield)
where Annual Interest Payment = (Coupon Rate / 100) x Face Value, and
Current Yield = (Annual Interest Payment / Price) x 100.
Using the given information, we can calculate the price to pay for each bond
For ABC bond
Annual Interest Payment
= (7.5 / 100) x $1000 = $75
Current Yield
= (Annual Interest Payment / Price) x 100 = (75 / $1042.50) x 100
= 7.2%
Price = (Annual Interest Payment) / (Current Yield)
= $75 / (7.2/100)
= $1041.67
So .... the price to pay for the ABC bond is approximately $1041.67.
For XYZ bond
Annual Interest Payment
= (8.4 / 100) x $1000
= $84
Current Yield
= (Annual Interest Payment / Price) x 100
= (84 / $1003.125) x 100
= 8.37%
Price = (Annual Interest Payment) / (Current Yield)
= $84 / (8.37/100)
= $1003.84
So, the price to pay for the XYZ bond is approximately $1003.84.
So, the closest option to the calculated prices is:
a. ABC: $1047.50
XYZ: $1,005.00
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A magazine listed the number of calories and sodium content (in milligrams) for 13 brands of hot dogs. Examine the association, assuming that the data satisfy the conditions for inference. Complete parts a and b
Option B is correct. The relationship is: H0 = 0 there is no linear association between calories and sodium content H1 ≠ 0 there is a linear association between colones and sodium content
The test statistic is 3.75
How to get the correct optionThe test statistics can be gotten from the data that we already have available in this question
The coefficient is given as 2.235
The Standard error of the coefficient is given as 0.596
The formula used is given as
Such that t = coefficient / Standard error
where the coefficient = 2.235
The standard error = 0.596
Then when we apply the formula we have
2.235 / 0.596
t statistic = 3.75
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An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 40 hours. a) if a sample of 30 bulbs has an average life of 780 hours, find a 96% confidence interval for the population mean of all bulbs produced by this firm. a) how large a sample is needed if we wish to be 96% confident that our sample mean will be within 10 hours of the true mean
The 96% confidence interval for the population mean is (764.34, 795.66) and a sample size of at least 123 bulbs is needed to be 96% confident that the sample mean will be within 10 hours of the true mean.
a) To find the 96% confidence interval for the population mean, we can use the formula:
CI = x ± z* (σ/√n)
where x is the sample mean, σ is the population standard deviation, n represents the sample size, and z* represents the critical value for the desired level of confidence.
From the given information, we have x = 780, σ = 40, n = 30, and we can find the critical value using a standard normal distribution table or a calculator. For a 96% confidence level, the critical value is 1.750.
When these values are entered into the formula, we get:
CI = 780 ± 1.750 * (40/√30)
CI = 780 ± 15.66
Therefore, the 96% confidence interval for the population mean is (764.34, 795.66).
b) To determine the sample size needed to be 96% confident that our sample mean will be within 10 hours of the true mean, we can use the formula:
n =[tex](z* \sigma / E)^2[/tex]
where z* is the crucial value for the desired level of confidence, standard deviation is the population standard deviation , E is the maximum error or margin of error, and n is the sample size.
From the given information, we have z* = 1.750, σ = 40, and E = 10. When these values are entered into the formula, we get:
[tex]n = (1.750 * 40 / 10)^2[/tex]
n = 122.5
Therefore, we need a sample size of at least 123 bulbs to be 96% confident that our sample mean will be within 10 hours of the true mean.
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Hurry!!! Find w. (25 points)
4(−4.6 + w) = 22.24
w = 10.16
w = 4.2
w = 1.2
w = −1.2
The value of w in the expression is 10.2
How to calculate the value of w?The expression is given as, we are required to calculate the value of w
4(-4.6 +w)= 22.24
the first step is to open the bracket to calculate the value of x, multiply 4 with the value in the bracket
-18.4 + 4w= 22.24
collect the like terms between both sides by separating the numbers that have alphabets included in it
4w= 22.24 + 18.4
4w= 40.8
Divide by the coefficient of w which is 4
4w/4= 40.8/4
w= 40.8/4
w= 10.2
Hence the value of w in the expression is 10.2
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Use undetermined coefficients to solve the nonhomogeneous equation
y″+11y′+28y=e^(5x)+x+4
a) write the characteristic equation of the associated homogeneous part by using the variable .
b) write the solution the associated homogeneous part, by using arbitrary constants 1 and 2 for 1 and 2. (note that: the order of the solutions are very important. you should write first 1 such that 1(−1/4)= and second 2 such that 2(−1/7)=.)
c) write the form of the any particular solution (we are using ,, etc. for undetermined coefficients for the correspoding functions in in the same order.):
and evaluate its derivatives and then found ″
d) thus evaluate the undetermined coefficients
e) finally write the general solution y=
a) The characteristic equation is r^2 + 11r + 28 = 0.
b) The associated homogeneous equation are y1(x) = c1e^(-4x) and y2(x) = c2e^(-7x).
c) The form of the particular solution is y_p(x) = Ae^(5x) + Bx + C.
d) By solving the system of equations, it gives A = 1/28, B = 1/28, and C = -211/196.
e) The general solution is y(x) = c1e^(-4x) + c2e^(-7x) + (1/28)e^(5x) + (1/28)x - 211/196.
a) The characteristic equation of the associated homogeneous equation is r^2 + 11r + 28 = 0.
b) Factoring the characteristic equation gives (r + 4)(r + 7) = 0, so the solutions to the associated homogeneous equation are y1(x) = c1e^(-4x) and y2(x) = c2e^(-7x).
c) The form of the particular solution is y_p(x) = Ae^(5x) + Bx + C. Taking the first and second derivatives of y_p(x) gives y_p'(x) = 5A + B and y_p''(x) = 0.
d) Substituting y_p(x), y_p'(x), and y_p''(x) into the original nonhomogeneous equation gives:
0 + 11(5A + B) + 28(Ae^(5x) + Bx + C) = e^(5x) + x + 4
Simplifying this equation gives:
(28A)e^(5x) + (28B)x + 11(5A) + 11B + 28C = e^(5x) + x + 4
Comparing coefficients gives the system of equations:
28A = 1
28B = 1
11(5A) + 11B + 28C = 4
Solving this system of equations gives A = 1/28, B = 1/28, and C = -211/196.
e) The general solution to the nonhomogeneous equation is y(x) = y_h(x) + y_p(x), where y_h(x) = c1e^(-4x) + c2e^(-7x) and y_p(x) = (1/28)e^(5x) + (1/28)x - 211/196. Therefore, the general solution is:
y(x) = c1e^(-4x) + c2e^(-7x) + (1/28)e^(5x) + (1/28)x - 211/196.
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Select the statement that correctly describes the solution to this system of equations. 4x+2y=6
4x+2y=4
A. There is no solutions
B. There are infinitely many solutions
C. There is exactly one solution at (4,2)
D. There is exactly one solution at (6,4)
Answer:
Step-by-step explanation:
The statement that correctly describes the solution to this system of equations 4x+2y=6 and 4x+2y=4 is "There is no solutions". The correct option is A.
The given system of equations is 4x + 2y = 6 and 4x + 2y = 4.
On comparing the two equations, we notice that the left-hand side of both the equations is the same. However, the right-hand side of the two equations is different. This implies that the lines represented by the two equations are parallel to each other, since they have the same slope but different y-intercepts.
If two lines are parallel, they will never intersect. In this case, since the two equations represent two parallel lines, there is no point of intersection between them. Therefore, the system of equations has no solution.
Hence, the correct answer is A. There is no solution to this system of equations.
In summary, the given system of equations cannot be satisfied simultaneously, since the lines represented by the two equations are parallel to each other and hence do not intersect. Therefore, the system of equations has no solution.
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Help! Solve the problem in the photo
Use the following scenario to answer questions 1 and 2.
Tom and Jerry are sometimes late for school. The events Tand J are defined as follows:
T= the event that Tom is late for school.
J = the event that Jerry is late for school.
P (T) = 0. 25
P (TNJ) = 0. 15
P (Tºn JC) = 0. 7
On a randomly selected day, find the probability that at least one of Tom or Jerry are late for school.
The probability that at least one of Tom or Jerry are late for school is 0.4.
To find the probability that at least one of Tom or Jerry are late for school, we can use the formula:
P(T or J) = P(T) + P(J) - P(T and J)
Since we don't know the probability of Jerry being late (P(J)), we can use the complement rule:
P(J) = 1 - P(JC)
where JC represents the event that Jerry is not late for school.
Substituting the given probabilities:
P(T or J) = P(T) + [1 - P(JC)] - P(T and J)
P(T or J) = 0.25 + 0.3 - 0.15
P(T or J) = 0.4
Therefore, the probability that at least one of Tom or Jerry are late for school is 0.4.
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Find the points on the curve y - 2x - 4x2 - 11 at which the tangent is parallel to the line = 8x - 3.
The point on the curve y = -4x² - 2x - 11 where the tangent is parallel to the line 8x - 3 is (-1, -13).
To find the points on the curve where the tangent is parallel to the line, we need to find where the derivative of the curve is equal to the slope of the line.
The given curve is: y = -4x² - 2x - 11
The derivative of this curve is: y' = -8x - 2
The slope of the given line is: 8
We want to find the points where the derivative of the curve is equal to the slope of the line:
-8x - 2 = 8
Solving for x, we get:
x = -1
Now, we can plug this value of x back into the original equation to find the corresponding value of y:
y = -4(-1)² - 2(-1) - 11
y = -13
Therefore, the point on the curve where the tangent is parallel to the line 8x - 3 is (-1, -13).
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Sofia owns a small business selling ice cream. She knows that in the last week 56 customers paid cash, 6 customers used a debit card, and 18 customers used a credit card.
Based on these results, express the probability that the next customer will pay with a credit card as a fraction in simplest form
The probability that the next customer will pay with a credit card is 9/40.
To find the probability that the next customer will pay with a credit card, we need to determine the total number of customers and then calculate the fraction of those who used a credit card.
Step 1: Find the total number of customers.
56 customers paid cash, 6 customers used a debit card, and 18 customers used a credit card.
Total customers = 56 + 6 + 18 = 80 customers
Step 2: Calculate the probability of a customer using a credit card.
Number of customers who used a credit card = 18
Total number of customers = 80
Probability = (Number of customers who used a credit card) / (Total number of customers)
Probability = 18 / 80
Step 3: Simplify the fraction.
Divide both the numerator and denominator by their greatest common divisor (GCD). The GCD of 18 and 80 is 2.
18 ÷ 2 = 9
80 ÷ 2 = 40
Simplified fraction: 9/40
So, the probability that the next customer will pay with a credit card is 9/40.
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can someone help me please.
A spring with an m-kg mass and a damping constant 5 (kg/s) can be held stretched 0.5 meters beyond its natural length by a force of 2 newtons. If the spring is stretched 1 meters beyond its natural length and then released with zero velocity, find the mass that would produce critical damping. m = kg
The mass can be any value greater than zero.
To find the mass that would produce critical damping, we first need to find the damping coefficient, which is given by:
c = damping constant * 2 * √m
where m is the mass in kg.
In this case, c = 5 * 2 * √m = 10√m.
Next, we can use the equation for the displacement of a damped harmonic oscillator to find the value of m that produces critical damping:
x = e^(-ct/2m) * (A + Bt)
where x is the displacement from equilibrium, t is time, A and B are constants determined by the initial conditions, and c and m are the damping coefficient and mass, respectively.
For critical damping, we want the system to return to equilibrium as quickly as possible without oscillating, so we set the damping coefficient equal to the critical damping coefficient:
c = 2 * √km
where k is the spring constant.
Since the spring can be held stretched 0.5 meters beyond its natural length by a force of 2 newtons, we know that the spring constant is:
k = F/x = 2/0.5 = 4 N/m
Substituting this value into the equation for critical damping, we get:
10√m = 2 * √(4m)
Squaring both sides and simplifying, we get:
100m = 16m
84m = 0
Since this is a contradiction, there is no value of m that produces critical damping. Therefore, the mass can be any value greater than zero.
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Find for the equation V+y=x+y
The solution set is a vertical plane parallel to the y-axis and passing through the origin.
V + y = x + y can be simplified by canceling out the common term 'y' on both sides of the equation. This gives:
V = x
This is the equation of a plane in three-dimensional space where the 'x' and 'V' variables correspond to the horizontal and vertical axes respectively. Therefore, the solution set for this equation consists of all points in the plane where the 'V' coordinate is equal to the 'x' coordinate.
In other words, the solution set is a vertical plane parallel to the y-axis and passing through the origin.
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--The complete question is, What is the solution set for the equation V + y = x + y?--
what are the outcomes
A 6 sided number cube is rolled 5 times
Answer:
7776 outcomes
Step-by-step explanation:
To get the total number of outcomes we multiply the total number of possibilities for each roll. Since there are 5 rolls, the total number of outcomes will be:
6 x 6 x 6 x 6 x 6 = 7776 outcomes
Please help im begging you!!!
the perimeter of the trapezoid is 8x + 18. find the missing length of the lower base
Length of bottom base = 8x + 18 - (unknown)
To get the missing length of the lower base of the trapezoid, we need to use the formula for the perimeter of a trapezoid:
Perimeter = sum of all sides
For a trapezoid, this means:
Perimeter = length of top base + length of bottom base + length of left side + length of right side
In this case, we know that the perimeter is 8x + 18. We also know that the length of the top base and the lengths of the left and right sides are not given, so we'll just represent them with variables:
Perimeter = (length of top base) + (length of bottom base) + (length of left side) + (length of right side)
8x + 18 = (unknown) + (length of bottom base) + (unknown) + (unknown)
Simplifying: 8x + 18 = length of bottom base + (unknown)
Now we just need to isolate the length of the bottom base:
8x + 18 - (unknown) = length of bottom base
We can't simplify this any further without more information about the trapezoid, but we can say that the missing length of the lower base is:
Length of bottom base = 8x + 18 - (unknown)
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Write a numerical expression using at least three operations a parenthesis an exponent that when solved has a solution of 23
Therefore, when you solve this expression (6 + 5) x 2^2 - 4 , the solution is 23.
Here's an example of a numerical expression using at least three operations, a parenthesis, and an exponent that when solved has a solution of 23:
(6 + 5) x 2^2 - 4 = 23
Explanation:
- Parenthesis: (6 + 5) = 11
- Exponent: 2^2 = 4
- Multiplication: 11 x 4 = 44
- Subtraction: 44 - 4 = 40
- Solution: 40 divided by 2 = 20, then 20 plus 3 = 23
Therefore, when you solve this expression, the solution is 23.
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3. 07 Quiz: Combine Functions Nearpod i H George has opened a new store and he is monitoring its success closely. He has found that this store's revenue each month can be modeled by r(x) = x2 + 5x + 14 where x represents the number of months since the store opens the doors and r(x) is measured in hundreds of dollars. He has also found that his expenses each month can be modeled by c(x) = x2 - 4x + 5 where x represents the number of months the store has been open and c(x) is measured in hundreds of dollars. What does (r - c)(5) mean about George's new store? -O The new store will sell 900 items in its fifth month in business.
George's new store will have a profit of $5,400 in its fifth month in business.
We are given two functions: r(x) = x^2 + 5x + 14 for revenue, and c(x) = x^2 - 4x + 5 for expenses. We are asked to find the meaning of (r - c)(5).
Step 1: Subtract c(x) from r(x) to find (r - c)(x)
(r - c)(x) = r(x) - c(x) = (x^2 + 5x + 14) - (x^2 - 4x + 5)
Step 2: Simplify the expression
(r - c)(x) = x^2 + 5x + 14 - x^2 + 4x - 5 = 9x + 9
Step 3: Evaluate (r - c)(5)
(r - c)(5) = 9(5) + 9 = 45 + 9 = 54
The value (r - c)(5) = 54 represents the difference between the revenue and expenses in the store's 5th month of operation, measured in hundreds of dollars. In other words, George's new store will have a profit of $5,400 in its fifth month in business.
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A line has a slope of -2 and passes through the point (-3, 8). Write its equation in slope-
intercept form.
Write your answer using integers, proper fractions, and improper fractions in simplest form.
Answer:
y = - 2x + 2
Step-by-step explanation:
the equation of a line in slope- intercept form is
y = mx + c ( m is the slope and c the y- intercept )
here slope m = - 2 , then
y = - 2x + c ← is the partial equation
to find c substitute (- 3, 8 ) into the partial equation
8 = - 2(- 3) + c = 6 + c ( subtract 6 from both sides )
2 = c
y = - 2x + 2 ← equation of line
4 (23) A doll maker's profit function is given by P(x) = (x-4).* - 4 (4 pts) where OCX5 3.9 find the following: (a) The critical number(s) (if any) [ Hint: Simplify the function BEFORE you take the derivative of the function] (b) The production levels in interval notation where the function is decreasing. (4pts)
The profit function P(x) is given as P(x) = (x-4)^2 - 4. To find critical numbers, the derivative of P(x) is calculated and set to zero. The intervals where the function is decreasing are determined by analyzing the sign of P'(x) on the intervals determined by the critical number(s).
Let's address each part step by step:
(a) First, let's simplify the profit function, P(x), which is given by P(x) = (x - 4)^2 - 4. To find the critical numbers, we need to find the derivative of the profit function with respect to x and set it to zero.
P'(x) = d/dx [(x - 4)^2 - 4]
P'(x) = 2(x - 4)
Now, set P'(x) to zero and solve for x:
2(x - 4) = 0
x - 4 = 0
x = 4
So, there is one critical number, x = 4.
(b) To determine the intervals where the function is decreasing, we need to analyze the sign of P'(x) on the intervals determined by the critical number(s).
For x < 4, P'(x) = 2(x - 4) < 0, which means the function is decreasing.
For x > 4, P'(x) = 2(x - 4) > 0, which means the function is increasing.
In interval notation, the function is decreasing on the interval (-∞, 4). Keep in mind that the original function has a domain restriction of 0 ≤ x ≤ 5, so considering that, the production levels where the profit function is decreasing are on the interval (0, 4).
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I need help! Solve for X
what is the value of sin 45 but as a fraction?
The exact value of sin 45° is [tex]\dfrac{\sqrt{2} }{2}[/tex]
Since we have given that
[tex]\text{sin} \ 45^\circ[/tex]
We need to find the exact value of sin 45°.
From the trigonometric table,
[tex]\text{sin} \ 45^\circ=\dfrac{1}{\sqrt{2}}[/tex]
We need to write it as a simplified fraction,
So, for this, we will rationalize the denominator:
[tex]\dfrac{1}{\sqrt{2}}\times\dfrac{\sqrt{2} }{\sqrt{2}}[/tex]
[tex]=\dfrac{\sqrt{2} }{2}[/tex]
Hence, the exact value of sin 45° is [tex]\dfrac{\sqrt{2} }{2}[/tex]
Answer: 1 divided by the square root of 2
Step-by-step explanation:
Let's set up an example, if the angle is forty five degrees, and the opposite length is 1, we can solve this as sin to get to the hypotenuse,
1. sin(45) = 1/hyp
2. sin(45) times hyp = 1
3. hyp = sin(45)/1
If we take any answer and put it over the hypotenuse as sin, we can see that it is going to end up as 1/√2, or 0.707
I did 1 because you are just asking for sin(45).
Alleen can read 1. 5 pages for every page her friend can read. Alleen's mom was very excited and she said to Alleen: "So, if your friend reads 20 pages, you can read 25 in the same time period!" Is Alleen's mom correct?
Alleen's mom is not correct because if her friend reads 20 pages, she can read 30 pages in the same time period.
To answer this question, we need to use the terms "ratio" and "proportion". The given ratio of Alleen's reading speed to her friend's speed is 1.5:1. If Alleen's friend reads 20 pages, we can use proportion to find how many pages Alleen can read:
1.5 / 1 = x / 20
To solve for x (the number of pages Alleen reads), we can cross-multiply:
1.5 * 20 = 1 * x
30 = x
So, if Alleen's friend reads 20 pages, Alleen can read 30 pages in the same time period.
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How can you solve x3-2=2?
Answer: x=4/3
Step-by-step explanation:
3x-2=2
3x=2+2
3x=4
x=4/3
Mr. Smith claims that 20% of students have at least two cell phones: one phone that works, and one broken phone they use as a decoy for when teachers ask them to hand in their phone because they are spending all of their class time looking at it instead of learning. Mr. Novotny takes a random sample of 500 students and finds that 88 have two or more cell phones. At α = 0. 05, test mr. Smith claim
The proportion of students from a random sample of 500 fail to reject the null hypothesis and can not support Mr. Smith's claim as per the data.
Percent of students claim they have at least two cell phones = 20%
Sample size = 500
Significance level α = 0. 05
This is a hypothesis testing problem with the following hypotheses,
Null hypothesis (H₀),
The proportion of students who have at least two cell phones is 0.20.
Alternative hypothesis (Hₐ),
The proportion of students who have at least two cell phones is greater than 0.20.
Use a one-tailed z-test for proportions to test the null hypothesis at a significance level of α = 0.05.
The test statistic is calculated as,
z = (p₁ - p₀) / √(p₀(1-p₀)/n)
where p₁ is the sample proportion,
p₀ is the null hypothesis proportion,
and n is the sample size.
Using the values in the problem, we get,
p₁ = 88/500
= 0.176
p₀ = 0.20
n = 500
z = (0.176 - 0.20) / √(0.20(1-0.20)/500)
= -1.34
Using a standard normal distribution table,
the p-value for z = -1.34 is approximately 0.0901.
Since the p-value (0.0901) is slightly greater than the significance level (0.05),
Fail to reject the null hypothesis.
Do not have sufficient evidence to conclude that the proportion of students who have at least two cell phones is greater than 0.20.
Therefore, cannot support Mr. Smith's claim based on the given data as fail to reject the null hypothesis.
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Does 4(9x+6)=36x-7 have many solutions,no solutions,or one solutions
Answer:
no solution
Step-by-step explanation:
There are no values of x that make the equation true.
PLEASE PLEASE URGENTLY HELP!!!
DECIMAL ROUNDED TO THE NEAREST TENTH!!!!
PLEASE SHOW WORK!!
Answer: 7.1
Step-by-step explanation:
Use pythagorean again.
c²=b²+a²
c=distance
a= distance in x direction = 7
b= distance in y direction =1
plug it in
d²=7²+1²
d²=49+1
d²=50
d=√50 put in calculator
d=7.1
A smart phone screen measures 5 inches by 7 inches. It is surrounded by a frame of width w. Write an expression in standard form for the total area of the screen and frame
Answer:
4x² + 24x + 35
Step-by-step explanation:
Total area = (7 + 2x)(5 + 2x)
= 35 + 10x + 14x + 4x²
= 4x² + 24x + 35
the number of thunderstorms in indiana in a calendar month is normally distributed with a mean of 75, and a standard deviation is 20 . single month is randomly selected. find the probability that the number of thunderstorms in that month is greater than 85. sample of ten months is selected. find the probability that the mean number of thunderstorms per month in this sample is greater than 85.
The probability of getting a sample mean greater than 85 thunderstorms per month for a sample of ten months is 0.0008.
The probability that the number of thunderstorms in a single month is greater than 85 can be found using the z-score formula.
z = (85 - 75) / 20 = 0.5
Using a standard normal distribution table, the probability of z being less than 0.5 is 0.6915. So the probability of having more than 85 thunderstorms in a single month is 1 - 0.6915 = 0.3085 or about 30.85%.
t = (85 - 75) / 2.00 = 5.00
Using a t-distribution table with 9 degrees of freedom, the probability of t being greater than 5.00 is very close to 0. Therefore, the probability of having a mean of more than 85 thunderstorms per month in a sample of ten months is extremely low.
Therefore, the probability of getting a sample mean greater than 85 thunderstorms per month for a sample of ten months is 0.0008.
Learn more about standard deviation
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