# The standard deviation of given population is 4.5 with a mean of 60 and the refit population has a standard deviation of 5.2 with a mean of 75. Calculate the coefficient of variation for both populations and comment on the

15,651 questions, page 22
1. ## algebra

neil was growing a culture of bacteria for a biology experiment. he noticed that the population doubled after 90 minutes. if the population grows exponentially, how many times the original population will there be after six hours?

asked by Anonymous on January 19, 2011
2. ## Algebra1

Population of Mexico has been increasing at annual rate of 1.7% if population was 100,350,000 in year 2000, predict population in 2015. Round to nearest number

asked by Monique on February 27, 2017
3. ## Biology

A biologist found that 20% of a population of bats are brown, which is recessive. assuming the population shows Hardy-Weinberg equilibrium, determine the genotype and the allele frequencies of the population?

asked by Sarah on March 10, 2017
4. ## algebra

neil was growin a culture of a bacteria for biology experiement. he noticed that the population doubled after 90 minutes. if the population grows exponentially, how many times the original population will there be after 6 hours?

asked by renee on February 5, 2009
5. ## Algebra 2

Recursion formula for a given population for each interval,n, at a time, and k is a constant called the Malthusian factor: a_n=ka_n-1(1-a_n-1) - Assuming n is measured in weeks, calculate the insect population for weeks 2, 3, and 4 if the initial

asked by Nan on August 7, 2014
6. ## Statistic

A school counselor tests the level of depression in fourth graders in a particular class of 20 students. The counselor wants to know whether the kind of students in this class differs from that of fourth graders in general at her school. On the test, a

asked by Anonymous on December 6, 2009
7. ## Statistics

With a known population mean of 100, and a known standard error of the mean of 7.5, what is the probability of selecting at random a sample whose mean is 110 or greater? I need help getting this started, thanks

asked by Bee on November 8, 2010
8. ## Statistics

With a known population mean of 100, and a known standard of error of the mean of 7.5, what is the probability of selecting at random a sample whose mean is equal to 110 or greater?

asked by Veronica on February 27, 2015
9. ## stats

Determine the standard error of the mean if a random sample of 52 is pulled from a population with µ = 82 and ó = 18. Round your answer to two decimal places

asked by Anonymous on November 4, 2011
10. ## Math check

The middle 69% of a normally distributed population lies between what two standard scores? (Give your answers correct to two decimal places.) 0.69 and 0.31

asked by Sue 6 on June 12, 2013
11. ## Statistics

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the

asked by Eric on June 2, 2013
12. ## Statistics

In the library on a university campus, there is a sign in the elevator that indicates a limit of 16 people. in addition there is a weight limit of 2500 lbs. assume that the average weight of students, faculty, and staff on campus is 150 lbs, that the

asked by Eric on June 2, 2013
13. ## statistics

1)According to past record the average daily sales for a sporting goods store was \$3456.00. After a new advertising campaign, the manager wants to see if the average daily sales have changed. A random sample of 20 days gives a sample mean of 3655 with a

asked by Bobby on December 6, 2014
14. ## Math--Statistics

I have a couple of questions that need review--I've answered them, but I'm not sure if I'm correct. 1.)Suppose you interview 10 randomly selected workers and ask how many miles they commute to work. You'll compute the sample mean commute distance. Now

asked by Anonymous on March 15, 2011
15. ## statistics

Which is relatively better a score of 48 on psychology test or a score of 52 on an economics test, Scores on the psychology test have a mean of 87 and a standard deviation of 14. Scores on the economics test have a mean of 53 and a standard deviation of 8.

asked by angela on October 27, 2013
16. ## Math

You are considering two mutual funds for your investment. The possible returns for the funds are dependent on the state of the economy and are given in the accompanying table. State of the Economy | Fund A | Fund B Good | 20% | 40% Fair | 10% | 20% Poor |

asked by Will on May 24, 2015
17. ## statistics

researchers believe a new sleep on average 10 hours per night ( µ = 10), with a population standard deviation of 2.3 hours(s=2.3) it is assume that the number of hours of sleep per night is normal distributed , however you think this drug causes people to

asked by jessica on June 13, 2011
18. ## Math

For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected. If

asked by Ashley Colley on February 9, 2016
19. ## Math

For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected. If

asked by Zack on February 12, 2016
20. ## algebra

For a specific type of machine part being produced, the diameter is normally distributed, with a mean of 15.000 cm and a standard deviation of 0.030 cm. Machine parts with a diameter more than 2 standard deviations away from the mean are rejected. If

asked by D'Quan on September 15, 2015
21. ## Math

LongLast Inc. produces car batteries. The mean life of these batteries is 60 months. The distribution of the battery life closely follows the normal probability distribution with a standard deviation of 8 months. As part of its testing program, LongLast

asked by Mark on April 25, 2014
22. ## Statistics

(25 pts, 5 pts each) The ounces of coffee that a machine dispenses in 5-ounce cups have normally distributed. Suppose a sample of size 6 was taken from this machine, as shown as follows: 5.05 5.03 5.10 5.02 4.98 5.00 (for all calculations, keep at least

asked by Trell on May 9, 2014
23. ## statistics

According to U.S. News & World Report data, in 1995 tuition costs at Indiana University, a public university, were \$2,984 per year, while the tuition costs at the University of Evansville, a private university in Indiana, were \$11,800 per year. In that

asked by mike on September 27, 2014
24. ## math

In 1805, the population of a small town was 2120. By 1905, the population increased to 115% of the 1895 figure. a) what was the population in 1905? b) find the increas in population from 1895 to 1905.

asked by jazz on November 1, 2008
25. ## Algebra

1)A bookshelf holds 4 mysteries, 3 biograpghies, 1 book of poetry, and 2 reference books. If a book is selected at random from the shelf, find the probability that the book selected is a biography or reference book. A)1/2 B)1/6 C)5/6 D)3/50 I chose A 5

asked by Jon on February 22, 2008
26. ## Statistics

Suppose that you are designing an instrument panel for a large industrial machine. The machine requires the person using it to reach 2 feet from a particular position. The reach from this position for adult women is known to have a mean of 2.8 feet with a

asked by Lamont Sanford on August 5, 2014
27. ## statistics

Assume that men have IQ scores that are normally distributed with a mean of 99 and a standard deviation of 13. Find the IQ score that separated the lower 30% of the others. Round up to the nearest integer.

asked by e on November 13, 2016
28. ## statistics

The following data lists the average monthly snowfall for January in 15 cities around the US: 26 6 5 45 44 10 39 33 15 33 11 36 36 4 32 Find the mean, variance, and standard deviation. Please show all of your work.

asked by Anonymous on January 30, 2012
29. ## Statistics

assume that adults have IQ scores that are normally distributed with a mean of 105 and a standard deviation of 15 find the probability that a randomly selected adult has an IQ between 89 and 121 ?

asked by Rebecca on December 12, 2012
30. ## statistics

The following data lists the average monthly snowfall for January in 15 cities around the US: 20 9 35 46 44 17 32 25 30 14 28 14 9 15 20 Find the mean, variance, and standard deviation. Please show all of your work.

asked by Tywania on January 30, 2012
31. ## stats.

The amount that airlines spend on food per passenger is normally distributed with mean \$8.00 and standard deviation \$2.00. What is the probability that a randomly selected airline spends more than \$12.50.

asked by chris on April 2, 2013
32. ## Math

a random sample of 28 patients across the country had an average cost of 5250 with a standard deviation of 629.at a= 0.025 can it be concluded that the mean is less than 5400

asked by Anonymous on April 27, 2014
33. ## use chebyshev's theorem to find what percent of th

use chebyshev's theorem to find what percent of the values will fall between 241 and 349 for a data set with a mean of 295 and standard deviation of 18

asked by Anonymous on July 25, 2012
34. ## statistics

The heights of young women are approximately normal with a mean 64.5 in and a standard deviation of 2.5 in. What is the probability that a woman chosen at random is taller than 63.6 inches?

asked by Lynn on August 14, 2012
35. ## use chebyshev's theorem to find what percent of th

use chebyshev's theorem to find what percent of the values will fall between 241 and 349 for a data set with a mean of 295 and standard deviation of 18

asked by Anonymous on July 25, 2012
36. ## Stats

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. The value of P(X < 10) is

asked by Tracy on March 29, 2014
37. ## Statistics

Calculate the mean and standard deviation of the probability distribution created by rolling a dice. Either show work or explain how your answer was calculated.

asked by Peter on October 9, 2011
38. ## Statistics

I am trying to find out the cut off score for selecting 10% of applicants with a mean of 500 and a standard deviation of 100 assuming that the standadized test is normally distributed.

asked by Sam on March 21, 2011
39. ## hialeah campus

Assume that women's heights are normally distributed with a mean of 63.6 and a standard deviation of 2.5 a) If 90 woman is randomly selected, find the probability that they have a mean height between 62.9 and 64.0 inches.

asked by Anonymous on July 6, 2016
40. ## Biostats

If the average (xbar) on an assignment in a class was 82% with a standard deviation (s) of 4.8, what is the z-score for someone scoring 75% (round to the one hundredths place or two decimal places)?

asked by brittany on February 3, 2013
41. ## statistics

A standardized test has a mean of 88 and a standard deviation of 12. What is the score at the 90th percentile? Assume a normal distribution. how would I solve? a. 90.00 b. 112.00 c. 103.36 d. 91.00

asked by Nicole on September 16, 2014
42. ## statistics

I need a estimate within \$25, the true average of amount of postage a company spends each year. If I want to be 98% confident, how large a sample is necessary? The standard deviation is known to be \$80

asked by ann on March 29, 2013
43. ## Statistics

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. the value of P(X

asked by Anonymous on March 13, 2010
44. ## Statistics

The high temperature X (in degrees Fahrenheit) on January days in Columbus, Ohio varies according to the Normal distribution with mean 21 and standard deviation 10. the value of P(X

asked by Anonymous on March 13, 2010
45. ## Statistics

Which of the following is true about Standard Deviation? a. It is the maximum value minus the minimum value b. It a range of values c. It the average d. It a measure of spread e. It measures location

asked by Beata Chmielewska on September 15, 2010
46. ## statistics

In a distribution of sentence lengths in months like the following: 6, 12, 10, 18, 24, 360; which statistic would a researcher not want to report? a. standard deviation b. mean c. range d. raw numbers

asked by Jim on November 29, 2013
47. ## math

Use Chebyshev’s theorem to find what percent of the values will fall between 162 and 292 for a data set with a mean of 227 and standard deviation of 13.

asked by denise on June 23, 2011
48. ## Calculus

Calculate μ and σ, where σ is the standard deviation, defined by the following. σ^2 = integral between (−∞,∞) (x-μ)^2 p(x) dx The smaller the value of σ the more tightly clustered are the values of the random variable X about the mean μ. p(x)

asked by Anonymous on November 22, 2015
49. ## statistics

The following data lists the average monthly snowfall for January in 15 cities around the US: 38 0 47 32 42 31 40 47 35 43 36 17 36 8 1 Find the mean, variance, and standard deviation. Please show all of your work.

asked by Huffette on November 18, 2012
50. ## elementary math

Sabino took the ACT in 2003 and received a composite score of 22. If the mean and standard deviation for that year were, respectively, 20.8 and 4.8, what percent of all of the students who took the exams scored better than him?

asked by Sabrina on May 16, 2011
51. ## Math

An unfair coin with Pr[H]=0.25 is flipped 95 times. A random variable X is defined as the number of heads that occur. Find the standard deviation. Any help??

asked by Tiffany on April 2, 2012
52. ## statistics

For a chapter on the Central Limit Theorem; I have a Uniform Distribution problem were a & b are not given. Only the average, standard deviation, and sample size are given. How do you find a & b?

asked by Anonymous on May 15, 2011
53. ## statistics

Assume the IQ's of men and women can be described by a Normal model with a mean of 100 and a standard deviation of 15. For the first part: What percent of people do you expect to have IQ's over 120?

asked by alexandra on February 8, 2011
54. ## statistics

Find the standard deviation, Sigma, for the binomial distribution which has the stated values of n and p. Round your answer to the nearest hundredth. n = 639; p = 0.7

asked by todd on April 14, 2013
55. ## math

Sabino took the ACT in 2003 and received a composite score of 22. If the mean and standard deviation for that year were, respectively, 20.8 and 4.8, what percent of all of the students who took the exams scored better than him?

asked by Nicholas on May 16, 2011
56. ## discrete distribution

Find the mean and the standard deviation of the number of hours parked. (Round your intermediate values and final answers to 3 decimal places.)

asked by Anonymous on September 28, 2014
57. ## Calculus

Calculate μ and σ, where σ is the standard deviation, defined by the following. σ^2 = integral between (−∞,∞) (x-μ)^2 p(x) dx The smaller the value of σ the more tightly clustered are the values of the random variable X about the mean μ. p(x)

asked by Christina on November 22, 2015
58. ## Math

Scores on a marketing exam are known to be normally distribute with mean and standard deviation of 60 and 20, respectively. The syllabus suggests that the top 15% of the students will get an A in the course. What is the minimum score required to get an A?

asked by Sam on September 25, 2014
59. ## Algebra 2

The test scores for a math class are shown below. 81,84,82,93,81,85,95,89,86,94 What is the standard deviation of the data set? Roun your answer to the nearest tenth 4.9 5.5 5.3 5.1

asked by Whitney on May 19, 2014
60. ## statistics

e Chebyshev’s theorem to find what percent of the values will fall between 226 and 340 for a data set with a mean of 283 and standard deviation of 19.

asked by dee on November 13, 2011
61. ## Psychology

To measure the relationship between age and cell phone use, a researcher should use a Correlation Central tendency A histogram Standard deviation A t test

asked by yal on November 1, 2012
62. ## statistics

a quiz consists of 30 true or false questions. if the student guesses on each question, what is the standard deviation of the number of correct answers

asked by mike on April 29, 2013
63. ## statistics

What type of statistical information would I include in my report to determine our year-to-date performance of our division; example, mean, median, or standard deviation.

asked by jake on April 26, 2012
64. ## statistics

2. We would like to test whether the population mean is less than 40. Suppose that a hypothesis test is conducted to determine if the mean of the population has decreased or not. Describe what a Type II error would mean for this example. A) Reject H0 when

asked by ali awan on May 8, 2013
65. ## math

A researcher predicts that listening to music while solving math problems will make a particular brain area more active. To test this, a research participant has her brain scanned while listening to music and solving math problems, and the brain area of

asked by Donna on August 15, 2011

In 1994 the moose population in a park was measured to be 6400. By 1996, the population was measured again to be 6800. If the population continues to change linearly: Find an equation for the moose population, y,in terms of x, the years since 1994.

asked by Carlos on March 27, 2017
67. ## statistics

given mean distance of 16 miles standard deviation of 8 miles with sample of 75 commuters what is probability of sample mean commute distance is greater that 13 miles Search instead for given mean distance of 16 miles standard deviation of 8 miles with

asked by alma on October 25, 2014
68. ## statistics

Use the method specified to perform the hypothesis test for the population mean µ. The highest acceptable level of pesticide found in quail has been limited to 0.35 parts per million (ppm). A hunting organization measured the level of the pesticide found

asked by looking for someone to varify my work please on April 13, 2010
69. ## statistics

⦁ Find the probability that a data value picked at random from a normal population will have a standard score (z) that lies between the following pairs of z-values. ⦁ z = 0 to z = 2.10 ⦁ X

asked by sharon on January 1, 2018
70. ## statistics

Suppose a random sample of 80 measurements is selected from a population with a mean of 65 and a variance of 300. Select the pair that is the mean and standard error of x.

asked by veronica on February 26, 2013
71. ## statistics

Suppose a random sample of 80 measurements is selected from a population with a mean of 65 and a variance of 300. Select the pair that is the mean and standard error of x.

asked by veronica on February 26, 2013
72. ## statistics

Starting with a population that is normally distributed with a mean of 100 and a standard deviation of 12, answer the following questions (if possible). a. What is the probability of randomly drawing a single score between 100 and 106, p(100 < X < 106)? b.

asked by Daniel on October 15, 2011
73. ## statistics

Fast Auto Service provides oil and lube service for cars. It is known that the mean time taken for oil and lube service at this garage is 15 minutes per car and the standard deviation is 2.4 minutes. The management wants to promote the business by

asked by Karinna on February 14, 2009
74. ## precalculus

the population of a country is 65 millions if it grows exponentially in a rate of 1.5% annual 1.-calculate the estimate population in 12 years 2.-when the population increases 4 times could somebody please explain me this kind of problems where you need to

asked by steve alexander on November 25, 2008
75. ## math

6.22 A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular

asked by eid2013 on October 12, 2013
76. ## statistics

A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular sample

asked by eid2013 on October 14, 2013
77. ## math

A study of the Consideration of Future Consequences(CFC) scale found a mean score of 3.51, with a standard deviation of 0.61, for the 664 students in the sample(Petrocelli, 2003). For the sake of this exercise, let’s assume that this particular sample

asked by eid2013 on October 14, 2013
78. ## stats

8-A bakery stated that the average number of breads sold daily is 3000. An employee thinks that the actual value might differ from this and wants to test this statement. The correct hypotheses are: (1) H0 : ¦Ì = 3000 H1 : ¦Ì not= 3000 (2) H0 : ¦Ì >

asked by Judy and group on April 1, 2010
79. ## statistics

Random samples of size n=10 are taken from a normal population whose statndard deviation is known to be 5. Calculate the area under the sampling distribution curve for x bar between the points u-1 and u+1. That is find the probability that the sample mean

asked by joe on November 23, 2012
80. ## Math

The list below gives the number of patrons per day over a 30-day period during July at a theatre. 127 126 125 132 128 122 156 172 183 171 160 140 154 160 122 187 185 158 112 145 168 187 117 120 171 171 156 163 168 162 a) Find the mean and standard

asked by Joe on May 24, 2017

h t t p: //tinypic . co m/r/309lnac/3 1. The population growth exhibited by population A to the right is what? Is is exponential? 2. Population B reaches its carry capacity at about what size? a. 0 b. 500 c. 1000 d. 1500 e. 2000 Is it 1500? 3. The plateau

asked by maggie on August 30, 2009

h t t p: //tinypic . co m/r/309lnac/3 1. The population growth exhibited by population A to the right is what? Is is exponential? 2. Population B reaches its carry capacity at about what size? a. 0 b. 500 c. 1000 d. 1500 e. 2000 Is it 1500? 3. The plateau

asked by maggie on August 30, 2009
83. ## STATISTICS

Suppose that a researcher is interested in estimating the mean systolic blood pressure, , of executives of major corporations. He plans to use the blood pressures of a random sample of executives of major corporations to estimate . Assuming that the

asked by RILEY on October 24, 2016
84. ## Pre calc

The general function P(t)= 640ekt is used to model a dying bird population, where Po = 640 is the initial population and t is time measured in days. Suppose the bird population was reduced to one quarter of its initial size after 9 days. How long will it

85. ## math

A sporting goods company has a distribution center that maintains inventory of fishing rods. The fishing rods have the following demand, lead time, and cost characteristics: Average demand = 95 units per day, with a standard deviation of 18 units Average

asked by Candace on July 17, 2012
86. ## experimental psychology

Given that on one section of the SAT the mean is 500 and the standard deviation is 100, what is the approximate probability of a student scoring 600 or higher on the test? Round as appropriate.

asked by Tatiana on March 16, 2016
87. ## statistics

cost of producing is 50 cents each and they sell for 1.25 each. demand for programs at each game is normally distributed with a mean of 2500 and standard deviation if 200. how many shouild be prodcued

asked by Anonymous on November 19, 2011
88. ## Statistics

X is a normally distributed random variable X with mean 15 and standard deviation 0.25. Find the values xL and xR of X that are symmetrically located with respect to the mean of X and satisfy P(xL < X < xR) = 0.80. (Hint. First solve the corresponding

asked by Anonymous on September 27, 2014
89. ## Math

using the range rule of thumb to approximate the standard deviation - a distribution of data has a maximum value of 80, a median value 0f 60.5 nd a minimum of 41. - Please round to the nearest tenth.

asked by Deb on December 11, 2010
90. ## Math

The purchases made by customers at a convenience store are normally distributed, with a mean of \$5.50 and a standard deviation of \$3.50. What is the probability that a randomly chosen customer makes a purchase between \$2.00 and \$9.00?

asked by Laurin on July 7, 2013
91. ## statistics

psychologist wants to interview subjects with IQ scores are normally distributed with mean of 100 and standard deviation of 15. find the score that separating the top of IQ frin the bottom 90%

asked by joe on May 9, 2012
92. ## Algerbra

Human body temperatures are normally distributed with a mean of 98.20°F and a standard deviation of 0.62°F if 19 people are randomly selected find the probability that they're mean by temperature will be less than 98.50 degrees Fahrenheit

asked by Kayla on September 16, 2014
93. ## Math

The purchases made by customers at a convenience store are normally distributed, with a mean of \$5.50 and a standard deviation of \$3.50. What is the probability that a randomly chosen customer makes a purchase between \$2.00 and \$9.00?

asked by Laurin on July 7, 2013
94. ## data analysis

A survey of 1500 college students found that 675 stay on campus in a dorm. Find the mean and standard deviation of the proportion of the sample.

asked by Anonymous on May 20, 2014
95. ## Statistics

Assume that adults have IQ scores that are normally distributed with a mean of 100 and a standard deviation of 15. Find the IQ score separating the top 37% from the others. Answer in one decimal place.

asked by Tracy on March 28, 2014
96. ## MAth

Scores of an IQ test have a bell shaped distribution with a mean of 100 and a standard deviation of 19. Use the empirical rule to determine the following. a.) What % of people has an IQ score between 81 and 119?

asked by quita on July 17, 2012
97. ## statistic

X is a normally distributed random variable X with mean 15 and standard deviation 0.25. Find the values xL and xR of X that are symmetrically located with respect to the mean of X and satisfy P(xL < X < xR) = 0.80. (Hint. First solve the corresponding

asked by kuhel on March 16, 2016
98. ## Prob&Stat

If 52% of the customers at a certain grocery store regularly use coupons, what is the approximate standard deviation of the sampling distribution of the proportion for samples of size 240? 2.1% 3.2% 4.7% 10.4%

asked by Bailey on December 14, 2014
99. ## Statistics for Social Science

A random sample of 80 students at a largae school shows an average grade of 72 in Algebra with a standard deviation of 4. Find the standar error.

asked by Pearl on November 24, 2012
100. ## distribution

In a school, the IQ scores of the students have a normal distribution with a mean value of 100, and a standard deviation of 10. What is the probability that the IQ score of a randomly selected student is at least 120? (10 p)

asked by ABDULA YUSUF on April 16, 2016