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
  66. word problem, please help

    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
  81. science: check my answers please

    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
  82. science (please check my answers)

    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

    asked by Madison on March 18, 2017
  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