Answer:
1899
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
In this problem, we have that:
Mean = 3234
Standard deviation = 871
Percentage of newborns who weighed between 1492 grams and 4976 grams:
1492 = 3234 - 2*871
So 1492 is two standard deviations below the mean.
4976 = 3234 + 2*871
So 4976 is two standard deviations above the mean.
By the Empirical Rule, 95% of newborns weighed between 1492 grams and 4976 grams.
Out of 1999:
0.95*1999 = 1899
So the answer is 1899
Find the inequality represented by the graph
Answer:
There is no graph to find an inequality on...
Step-by-step explanation:
A diameter of a particular circle has endpoints at A(-1, -2) and B(3,10). Which of the following is the
slope of the tangent drawn to this circle at point B?
A) -1/2
B) 4/5
C) -1/3
D) -4
Answer:
Option C) is correct
Step-by-step explanation:
Given: Endpoints of the diameter of the circle are A(-1, -2) and B(3,10)
To find: slope of the tangent drawn to the circle at point B
Solution:
Let [tex](x_1,y_1)=(-1,-2)\,,\,(x_2,y_2)=(3,10)[/tex]
Centre of the circle = [tex](\frac{x_1+x_2}{2},\frac{y_1+y_2}{2})=(\frac{-1+3}{2},\frac{-2+10}{2})=(1,4)[/tex]
Let [tex](h,k)=(1,4)[/tex]
Distance formula states that distance between points (a,b) and (c,d) is given by [tex]\sqrt{(c-a)^2+(d-b)^2}[/tex]
Radius of the circle = Distance between points [tex](-1,-2)[/tex] and [tex](1,4)[/tex] = [tex]\sqrt{(1+1)^2+(4+2)^2}=\sqrt{4+36}=\sqrt{40}[/tex] units
Let r = [tex]\sqrt{40}[/tex] units
Equation of a circle is given by [tex](x-h)^2+(y-k)^2=r^2[/tex]
[tex](x-1)^2+(y-4)^2=\left ( \sqrt{40} \right )^2\\(x-1)^2+(y-4)^2=40[/tex]
Differentiate with respect to x
[tex]2(x-1)+2(y-4)\frac{\mathrm{d} y}{\mathrm{d} x}=0\\\frac{\mathrm{d} y}{\mathrm{d} x}=\frac{1-x}{y-4}[/tex]
Put [tex](x,y)=(3,10)[/tex]
[tex]\frac{\mathrm{d} y}{\mathrm{d} x}=\frac{1-3}{10-4}=\frac{-2}{6}=\frac{-1}{3}[/tex]
So,
slope of the tangent drawn to this circle at point B = [tex]\frac{-1}{3}[/tex]
What’s the correct answer for this? Select all the apply
Answer:
B and C
Step-by-step explanation:
AP = BP
OC = OD
In a recent survey, 70% of HR directors thought that it was very important for business students to take a course in business ethics. For a sample of 12 HR directors, what is the probability that at least one of them does not think it very important for business students to take a business ethics course
Answer:
0.9862
Step-by-step explanation:
Given: According to 70% of HR directors, business students should take a course in business ethics.
To find: the probability that at least one of a sample of 12 HR directors does not think it very important for business students to take a business ethics course
Solution:
Probability refers to chances of occurrence of an event.
According to 70% of HR directors, business students should take a course in business ethics.
Therefore,
Probability that at least one of a sample of 12 HR directors does not think it very important for business students to take a business ethics
= 1 - Probability that everyone of a sample of 12 HR directors think that it very important for business students to take a business ethics
= [tex]1-\left ( \frac{70}{100} \right )^{12}[/tex]
[tex]=1-\left ( \frac{7}{10} \right )^{12}[/tex]
[tex]=1-(0.7)^{12}\\=1-0.0138\\=0.9862[/tex]
A study conducted to assist the impact of caffeine consumption, smoking, alchohol consumption, and physical activity on cardiovascular disease. Suppose that 40% of participants consume caffeine and smoke. If 8 participants are evaluated what is the probability that: A. Exactly half of them consume caffene and they smoke?
Answer:
8.4
Step-by-step explanation:
A random sample of 1285 residents from rural and urban areas were surveyed about their opinion about using daylight savings time. Below is the gathered data. Assuming there’s no relationship between residential area and opinion on daylight savings time, how many people who live in a rural area would you expect to be in favor of continuing to use daylight savings time? Please round up to a whole number.
Stop using Daylight Savings Time Continue using Daylight Savings Time Total
Rural 341 281 622
Urban 353 310 663
Total 694 591 1285
Pearson's Chi-square test
X-squared 0.32 df= 1 p-value ?
Answer:
The expected number of people that lives in rural areas and is in favor of continuing using daylight savings time is 287.
Step-by-step explanation:
Hello!
There were 1285 residents from rural and urban areas surveyed about their opinion about using savings time. There are two variables of interest:
X₁: Area where the resident lives, categorized: "Rural area", "Urban area".
X₂: Opinion about using daylight savings time, categorized: "Stop", "Continue".
To know how many people who live in a rural area would you expect to be in favor of continuing to use daylight savings time, you have to calculate the expected frequency for that cell (See table in attachment)
The formula to calculate the expected frequencies is:
[tex]E_{ij}= \frac{O_{i.}*O_{.j}}{n}[/tex]
i: categories in rows i=1, 2
j: categories in columns j= 1, 2
Oi.: total observations for the i-row
O.j: total observations for the j-row
The category "rural" is in the first row, so its marginal is symbolized O₁.
The category "Continue" is in the second column, so its marginal is symbolized O.₂
The expected frequency for the people that live n rural areas and is in favor of continuing using daylight savings time is:
[tex]E_{12}= \frac{O_{1.}*O.2}{n}= \frac{622*591}{1285} = 286.07= 287[/tex]
I hope this helps!
Arguably, the top 5 race horses in U.S. history are Secretariat (S), Man O'War (M), Citation (C), War Admiral (W), and Seabiscuit (B).
Required:
a. Use this information to determine the number of possible samples (without replacement) of size 22 that can be obtained from the population of size 55.
b. If a simple random sampling procedure is to be employed, the chances that any particular sample will be the one selected are:________
Answer:
a) 10
b) 0.1 = 10%
Step-by-step explanation:
The combinations formula is used to solve this question, since the horses are chosen without replacement.
Combinations formula:
[tex]C_{n,x}[/tex] is the number of different combinations of x objects from a set of n elements, given by the following formula.
[tex]C_{n,x} = \frac{n!}{x!(n-x)!}[/tex]
a. Use this information to determine the number of possible samples (without replacement) of size 2 that can be obtained from the population of size 5.
Combinations of 2 objects from a set of 5. So
[tex]C_{5,2} = \frac{5!}{2!(5-2)!} = 10[/tex]
b. If a simple random sampling procedure is to be employed, the chances that any particular sample will be the one selected are:________
In this procedure, the samples are all equally as likely to be chosen.
So
1/10 = 0.1 = 10%
What’s the correct answer for this?
Answer:
D
Step-by-step explanation:
JK = LM because they are equidistant from the centre and hence are equal in length
which equation represents a circle with a radius of 8 centered at (-3,4)
Answer:
(x+3)^2 + (y-4)^2 = 64
Step-by-step explanation:
We can write the equation of a circle as
(x-h)^2 + (y-k)^2 = r^2 where ( h-k) is the center and r is the radius
(x--3)^2 + (y-4)^2 = 8^2
(x+3)^2 + (y-4)^2 = 64
Exactly one of the numbers 2,3 5 and 7 is placed in each of the 4 empty regions formed by circles A, B and C so that the sum of the numbers in each circle is the same. Each number is used. What is the sum of the numbers in each circle? *
Answer:
The sum of the numbers in each circle is 17
Step-by-step explanation:
The numbers to choose from are:
2, 3, 5, 7
By this alone the biggest number must be in the overlap of the three circles.
Then just fill in the numbers in such a way that they all are used.
The sum of the numbers in each circle is 17.
See picture for a solution.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Answer:
question wrong
Step-by-step explanation:
2 same angles
[tex]\frac{13+5}{z} = \frac{z}{5} \\\\z^{2} = 5 * 18\\z^{2} = 90\\z = \sqrt{90} = 9,4[/tex]
Reduce the fraction to lowest terms. Do not use spaces in your answer.
Answer:
(r-s)/(r+s)
Step-by-step explanation:
Factor out the 5
On a snow day, Brooklyn created two snowmen in her backyard. Snowman A was built to a height of 60 inches and Snowman B was built to a height of 44 inches. The next day, the temperature increased and both snowmen began to melt. At sunrise, Snowman A's height decrease by 5 inches per hour and Snowman B's height decreased by 3 inches per hour. Let A(t)A(t) represent the height of Snowman A tt hours after sunrise and let B(t)B(t) represent the height of Snowman B tt hours after sunrise. Write the equation for each function and determine the number of hours after sunrise when both snowmen have an equal height.
Answer: it will take 9 hours.
Step-by-step explanation:
The rate at which the height of each snowman decreased is linear. This means that it was decreasing in arithmetic progression. The formula for determining the nth term of an arithmetic progression is expressed as
Tn = a + (n - 1)d
Where
a represents the first term of the sequence.
d represents the common difference
n represents the number of terms(hours)
Considering snowman A,
Tn = A(t)
n = t
a = 60 inches
d = - 5 inches(since it is decreasing)
Therefore,
A(t) = 60 + (t - 1)-5
A(t) = 60 - 5t + 5
A(t) = 65 - 5t
Considering snowman B,
Tn = B(t)
n = t
a = 44 inches
d = - 3 inches(since it is decreasing)
Therefore,
B(t) = 44 + (t - 1)-3
B(t) = 44 - 3t + 3
B(t) = 47 - 3t
For both snowmen to have an equal height, it means that
65 - 5t = 47 - 3t
- 5t + 3t = 47 - 65
- 2t = - 18
t = - 18/- 2
t = 9 hours
6114 chocolate bars are to shared equally between 24 large cake mixes how many bars does each cake mix get
Answer:
146,736
Step-by-step explanation:
6114 divided by 24 is 146,736
A math class is having a discussion on how to determine if the expressions 4 x minus x + 5 and 8 minus 3 x minus 3 are equivalent using substitution. The class has suggested four different methods. Which describes the correct method?
Answer:
Both expressions should be evaluated with one value. If the final values of the expressions are the same, then the two expressions must be equivalent.
Step-by-step explanation:
Answer:
The answer is:
B. Both expression should be evaluated with one value if the final values of the expressions are the same then the two expressions must be equivalent
How many school buses will be needed to take the children of Anderson school on a field trip ? Each bus can carry 60 people. 390 children and 30 adults are going on the trip
Answer:
7 school buses will be needed to take the children of Anderson school on a field trip
Step-by-step explanation:
number of children = 390
We are told that each bus carries 60 people
Therefore
60 people = 1 bus
1 person = (1 ÷ 60)
∴ 390 people = [tex]\frac{1}{60}[/tex] × [tex]\frac{390}{1}[/tex] = [tex]\frac{390}{60}[/tex] = 6.5 (approx. 7 buses)
Therefore, 7 school buses will be needed to take the children of Anderson school on a field trip, but the seventh bus will be half-filled with children.
Use properties of multiplication to show why 4 x 50 = 8 x 25.
Enter your answers in the boxes.
4 x 50 = 4 x
x 25) = (4 x
1) x 25 =
D) x 25
Answer: use the app: photomath
Step-by-step explanation:
Twenty percent of adults in a particular community have at least a​ bachelor's degree. Suppose x is a binomial random variable that counts the number of adults with at least a​ bachelor's degree in a random sample of 100 adults from the community. If you are using a calculator with the binompdf and binomcdf​ commands, which of the following is the most efficient way to calculate the probability that more than 60 adults have a​ bachelor's degree, ​P(x?>60)?
a. P(x < 60)=binompdf(100,0 20,59)
b. P(x<60)=binompdf(100.0.20.60)
c. P(x<60)= binomcdf(100,0,20,59)
d. P(x<60)=binomcdf (100.0.20.60)
Answer:
Step-by-step explanation:
Since x is a binomial random variable that counts the number of adults with at least a bachelor's degree, it means that there are only two outcome. It is either an adult has a bachelor's degree or not. The probability of success would be that the adult has a bachelor's degree. Therefore, probability of success, p = 20/100 = 0.2
Number of adults in the sample is 100
The number of success expected is x
We want to determine the probability of P(x ≥ 60)
Therefore, the most efficient way to calculate the probability that more than 60 adults have a bachelor's degree is
b. P(x<60)=binompdf(100.0.20.60)
This is because it is a discrete probability distribution function
The linear equation graphed above gives the height in feet above the ground of Shelly t seconds after she opened her parachute when jumping from an airplane. According to the graph, how many seconds after opening her parachute will Shelly be 2,000 feet above the ground?
Answer:
[tex]\large \boxed{\text{60 s}}[/tex]
Step-by-step explanation:
Assume your graph looks like the one below.
1. Calculate the equation of the straight line
The slope-intercept equation for a straight line is
y = mx + b
where m is the slope of the line and b is the y-intercept.
The line passes through the points (0,2600) and (30, 2300)
(a) Calculate the slope of the line
[tex]\begin{array}{rcl}m & = & \dfrac{y_{2} - y_{1}}{x_{2} - x_{1}}\\\\ & = & \dfrac{2300 - 2600}{30 - 0}\\\\& = & \dfrac{-300}{30}\\\\& = & \text{-10 ft/s}\\\\\end{array}[/tex]
(b) Locate the y-intercept
The y-intercept is at 2600 ft
(c) Write the equation for the line
h = -10t + 2600
(d) Calculate the time to 2000 ft
[tex]\begin{array}{rcl}h & = & -10t + 2600\\2000 & = & -10t + 2600\\-600 & = & -10t\\t & = & \dfrac{-600}{-10}\\\\& = & \text{60 s}\\\end{array}\\[/tex]
Shelley will be at 2000 ft 60 s after opening the parachute.
Let the given line pass through the point that is [tex]\bold{(0,2600)\ \ and\ \ (20, 2400)}[/tex]
[tex]\therefore[/tex]
[tex]\to \bold{\frac{H-2400}{t-20}} \bold{= \frac{2600-2400}{0-20}}\\\\[/tex]
[tex]\bold{=\frac{200}{-20} }\\\\ \bold{= -\frac{200}{20}}\\\\ \bold{= - 10}\\\\[/tex]
[tex]\to \bold{H-2400=-10t+200}\\\\\to \bold{H+10t=2400+200}\\\\\to \bold{H+10t=2600}\\\\\to \bold{H=2600-10t}\\\\[/tex]
Let
time (t) in second
Height (h) in feet
for [tex]\bold{\ H=2000\ feet\\}[/tex]
[tex]\to \bold{2000=2600-10t}\\\\\to \bold{10t = 2600- 2000}\\\\\to \bold{10t = 600}\\\\\to \bold{t=\frac{600}{10}}\\\\\to \bold{t= 60\ second}\\\\[/tex]
Learn more:
brainly.com/question/3012638
which multiplication equation can be used to explain the solution to 15 divided by 1/3
1) 5 x 3 =15
2) 45 x 1/3
3) 1/3 x 15 =5
4) 1/5 x 15 =3
Answer:
Step-by-step explanation:
"15 divided by 1/3" comes out to:
15 15 3
------- = -----* ----- = 45
1/3 1 1
Recall that to divide 15 by 1/3 we invert 1/3, obtaining 3, and then multiply 15 by 3. The correct result is 45.
Multiplication equation B can be used to explain the solution to 15 divided by 1/3. Option 2 is correct.
What is the definition of arithmetic operation?Arithmetic is a branch of mathematics that studies numbers and the various operations that can be applied to them. The four basic math operations are addition, subtraction, multiplication, and division.
The solution of the expression is;
[tex]x= \frac{15}{\frac{1}{3} } \\\\\ x= 15 \times 3\\\\ x=45[/tex]
The answer of the given equation resembles the option B. Multiplication equation B can be used to explain the solution to 15 divided by 1/3
Hence, option 2 is correct.
To learn more about the arithmetic operation, refer;
brainly.com/question/20595275
#SPJ2
A truck was purchased for $120,000 and it was estimated to have a $24,000 salvage
value at the end of its useful life. Monthly depreciation expense of $2,000 was recorded
using the straight-line method. The annual depreciation rate is
Answer:
25
Step-by-step explanation:
A travel magazine conducts an annual survey where readers rate their favorite cruise ship. Ships are rated on a 10 point scale, with higher values indicating better service. A sample of 20 ships that carry fewer than 500 passengers resulted in a average rating of 6.93 with standard deviation 0.31. A sample of 55 ships that carry more than 500 passengers resulted in an average rating of 7.07 with standard deviation 0.6. statcrunch. Assume that the population standard deviation is 4.58 for ships that carry fewer than 500 passengers and 3.95 for ships that carry 500 or more passengers.
Round your all answers to two decimal places.
a. What is the point estimate of the difference between the population mean rating for ships that carry fewer than 500 passengers and the population mean rating for ships that carry 500 or more passengers?
b. At 95% confidence, what is the margin of error?
c. What is a 95% confidence interval estimate of the difference between the population mean ratings for the two sizes of ships?
Answer:
a) The point estimate of the difference between the populations is Md=-0.14.
b) The margin of error at 95% confidence is 0.212.
c) The 95% confidence interval for the difference between means is (-0.352, 0.072).
Step-by-step explanation:
We have to calculate a 95% confidence interval for the difference between means.
The sample 1 (ships under 500 passengers), of size n1=20 has a mean of 6.93 and a standard deviation of 0.31.
The sample 2 (ships over 500 passengers), of size n2=55 has a mean of 7.07 and a standard deviation of 0.6.
The difference between sample means is Md=-0.14.
[tex]M_d=M_1-M_2=6.93-7.07=-0.14[/tex]
The estimated standard error of the difference between means is computed using the formula:
[tex]s_{M_d}=\sqrt{\dfrac{\sigma_1^2}{n_1}+\dfrac{\sigma_2^2}{n_2}}=\sqrt{\dfrac{0.31^2}{20}+\dfrac{0.6^2}{55}}\\\\\\s_{M_d}=\sqrt{0.005+0.007}=\sqrt{0.011}=0.11[/tex]
The critical t-value for a 95% confidence interval is t=1.993.
The margin of error (MOE) can be calculated as:
[tex]MOE=t\cdot s_{M_d}=1.993 \cdot 0.11=0.212[/tex]
Then, the lower and upper bounds of the confidence interval are:
[tex]LL=M_d-t \cdot s_{M_d} = -0.14-0.212=-0.352\\\\UL=M_d+t \cdot s_{M_d} = -0.14+0.212=0.072[/tex]
The 95% confidence interval for the difference between means is (-0.352, 0.072).
Round 954 to the nearest hundred.
Answer:
1000
Step-by-step explanation:
5 or more add one more
4 or less let it rest
so it becomes 1000
The expression (2x + 1)4 is expanded and simplified. Which monomial listed below is a term in the result? 8x3 12x3 32x3 48x3
Answer:
32x^3
Step-by-step explanation:
[tex](2x+1)^4=(2x)^4+4(2x)^3(1)+6(2x)^2(1)^2+4(2x)(1)^3+(1)^4\\\\=16x^4 +\boxed{32x^3} +24x^2+8x+1[/tex]
_____
Comment on the question
It is helpful if you designate exponents with a caret (^). We expect the expanded form of (2x+1)4 to be 8x+4. (2x+1)^4 is entirely different. Similarly, 8x3 = 24x, whereas 8x^3 is something else.
32x^3
It is helpful if you designate exponents with a caret (^). We expect the expanded form of (2x+1)4 to be 8x+4. (2x+1)^4 is entirely different. Similarly, 8x3 = 24x, is the answer to the question
The earth moves at about 98,000 feet per second as it resolves around the Sun. How fast is that in miles per hour?> (recall that 1 mile is 5,280.00 feet.)
Answer:
[tex]\frac{98000 ft}{1 second}\times \frac{? second}{1 hour}\times \frac{1 mile}{5280 ft}[/tex]
Step-by-step explanation:
If you cancel out the same unit, one from numerator and one from denominator, you will get mile/ hour as asked. The leftover is doing your math.
You finish your work!!
I don't care about the evaluation. I do care if you can work by yourself and understand the work
How many fluid ounces are there in 3 pints and 12 fluid ounces?
Answer:
60 fluid ounces
Mark my as brainliest please
a village is 20 miles away from Belfast. Connor drives from the village to Belfast at an average speed of 40mph. Kelly drives from the village to Belfast at an average speed of 50mph. How much longer will the journey take Connor in minutes?.
Answer:
6 minutes
Step-by-step explanation:
Connor drives from the village to Belfast at an average speed of 40mph.
The distance covered is 20 miles.
Time = distance/ speed
Time = 20/40
Time = 0.5 hours
Time = 30 minutes.
Kelly drives from the village to Belfast at an average speed of 50mph.
Time = distance/speed
Time = 20/50
Time = 0.4 hours
Time = 24 minutes
It will take Conor 30 - 24 = 6 minutes longer than Kelly
in a poll 267 students voted. nominee c received 2/3 of the votes. how many votes did nominee c receive?
Answer:
89
Step-by-step explanation:
2/3 times 267 is 178 after that you have to sub 178 from 267
The length of a rectangle is 8 less than the width. The perimenter is 44 meters. Find the dimension of the rectangle
Answer:
Length = 7
Width = 15
Step-by-step explanation:
L= x
W= x-8
2x+2(x-8)=44
tg105°-cotg105° = ?
Please help fast!!! Please
Using only the trig ratios of 45 and 60 degrees, we use angle-sum to compute [tex]\tan 105^\circ=\tan(60^\circ+45^\circ)=\frac{\tan 60^\circ+\tan 45^\circ}{1-\tan 60^\circ\tan 45^\circ}=\frac{\sqrt{3}+1}{1-\sqrt{3}}=-2-\sqrt{3},[/tex] so [tex]\cot 105^\circ=\frac{1}{\tan 105^\circ}=-2+\sqrt{3}[/tex] and [tex]\tan 105^\circ-\cot105^\circ=\boxed{-2\sqrt{3}}.[/tex]
