1. statistics

    Reading placement scores for a particular college are normally distributed with a mean of 72 and a standard deviation of 7. a) draw a sketch of the reading placement scores for students at this college. be sure to mark the mean and also to mark one and two

    asked by whitney on June 3, 2012
  2. College Algebra

    The growth of stray cat population, n(t) in a small town can be modeled as n(t) = no e 0.15 t where t is time in years. Given that in year 1995, the town had 20 stray cats. a) Find the projected population after 10 years b) Find the number of years

    asked by Please Help on April 3, 2018
  3. Algebra

    The growth of stray cat population, n(t) in a small town can be modeled as n(t) = no e 0.15 t where t is time in years. Given that in year 1995, the town had 20 stray cats. a) Find the projected population after 5 years b) Find the number of years required

    asked by Janell on March 30, 2018
  4. statistics

    The average score on a standardized test is 500 points with a standard deviation of 50 points. If 2,000 students take the test at a local school, how many students do you expect to score between 450 and 550 points?

    asked by Anonymous on July 6, 2011
  5. final exam

    a study shown that 20% of all college textbooks cost at least $70.it is known that the standard deviation of the prices of all college textbook is $9.50.assuming that prices of all college textbooks follow a normal distribution, find the mean price of all

    asked by Anonymous on May 21, 2013
  6. Math

    Home Depot sells compact fluorescent lamps (CFLs) that have a mean life of 10,000 hours with a standard deviation of 1,000 hours. In an order of 8,000 lamps, how many can be expected to last 11,000 hours or longer?

    asked by Joe DeLucia on March 6, 2016
  7. Statistics

    The amt of time cold sufferes will experience symptoms is normally distributed wiht a mean of 7.5 days and a standard deviation of 1.2 days what proportion of sufferers will experience in LESS THAN 4 days , also what proportion will experience sympotms for

    asked by Lauren on September 20, 2010
  8. statistic

    The average score on a standardized test is 750 points with a standard deviation of 50 points. If 2,000 students take the test at a local school, how many students do you expect to score between 700 and 800 points?

    asked by tom on July 21, 2011
  9. 12th grade

    Population: Patients at Toronto Hospitals(Population size-- 100,000) Topic: Quality of Service You are to conduct a survey on the above population to gather information upon the indicated topic. For this assignment, you must: 1.Describe a muti-stage

    asked by Anonymous on March 23, 2010
  10. statistics please

    a basketball scout randomly selected 144 players and timed howlong eah player took to perform a certain drill. the times in thissample were distributed with a mean of 8 minutes. the populationstandard deviation was known to be 3 minutes. (a) find the

    asked by gina on December 15, 2012
  11. math

    Thank goodness for this site! Two questions: first: in the 1990 U.S. census, the final count was 248,709,873 people. The general population is estimated to have been undercounted by 1.8%, that is, only 98.2% of the people were counted. If this were the

    asked by lauren on August 28, 2006
  12. college math

    10. For questions 10-13, use the following data: 13 29 41 60 89 14 26 53 7 14 What is the arithmetic mean of the data? (Points: 5) 20 14 34.6 82 11. What is the range of the data? (Points: 5) 14 34.6 82 50 12. What is the variance of the data? (Points: 5)

    asked by Anonymous on November 7, 2011
  13. math

    10. For questions 10-13, use the following data: 13 29 41 60 89 14 26 53 7 14 What is the arithmetic mean of the data? (Points: 5) 20 14 34.6 82 11. What is the range of the data? (Points: 5) 14 34.6 82 50 12. What is the variance of the data? (Points: 5)

    asked by Anonymous on November 7, 2011
  14. Math Probability

    Super stumped... Help please. The average distance geese fly south in the winter is approximately 380 miles with a standard deviation of 60 miles. Assuming that the distances are normally distributed, find the probability that a randomly selected goose

    asked by Patricia Marzetta on April 30, 2013
  15. chemsitry

    c. Use the enthalpy diagram provided above and apply Hess’s Law to determine the standard enthalpy of formation for C12O36H20N12 (s) using the results from part (a) and the following values: The standard enthalpy of formation of gaseous carbon dioxide is

    asked by Nora on October 23, 2010
  16. physics

    A cart of mass m = 0.84 kg on a track undergoes a collision with another cart. It's velocity before and after the collision, vi and vf is measured and found to be vi = 1.32±0.04 m/s and vf = 0.30±0.04 m/s. If the collision lasts a time interval Δt =

    asked by charisse on February 17, 2011
  17. physics

    A cart of mass m = 0.84 kg on a track undergoes a collision with another cart. It's velocity before and after the collision, vi and vf is measured and found to be vi = 1.32±0.04 m/s and vf = 0.30±0.04 m/s. If the collision lasts a time interval Δt =

    asked by charisse on February 17, 2011
  18. statistics

    John drives to work each morning and the trip takes an average of  = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of  = 5 minutes. For a randomly selected morning, what is the probability that John's

    asked by karla on April 17, 2011
  19. statistics

    Let x denote the time taken to run a road race. Suppose x is approximately normally distributed with a mean of 190 minutes and a standard deviation of 21 minutes. If one runner is selected at random, what is the probability that this runner will complete

    asked by Eddie on December 5, 2014
  20. Statistics

    John drives to work each morning and the trip takes an average of m = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning, what is the probability that John's

    asked by Anonymous on October 1, 2011
  21. Statistics

    The Amount of filling a half-liter (500ml)soft drink bottle is normally distributed. The process has a standard deviation of 5ml. The mean is adjustable. A. Where should the mean be set to ensure a 95% probability that a half-liter bottle will not be under

    asked by KT on April 11, 2014
  22. Statistics

    A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution graph of the number

    asked by Skin on October 31, 2011
  23. Maths

    A mathematics class has 200 members. If there is 12% absentee rate per class meeting, find: a) mean, variance and standard deviation number of students who will be absent from each class. b) Draw the probability table and distribution graph of the number

    asked by Skin on October 31, 2011
  24. Statistics

    It is known that the standard deviation for the number of minutes women spend applying makeup everyday is 17 minutes if you want to construct a 95% confidence interval for the mean amount of time women spend applying make up with a margin of error of no

    asked by Julio on June 6, 2012
  25. statistics

    John drives to work each morning and the trip takes an average of µ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of ó = 5 minutes. For a randomly selected morning, what is the probability that John’s

    asked by gina on March 4, 2012
  26. Statistics

    An electrical firm which manufactures a certain type of bulb wants to estimate its mean life. Assuming that the life of the light bulb is normally distributed and that the standard deviation is known to be 40 hours, how many bulbs should be tested so that

    asked by Blerp on November 16, 2012
  27. statistics

    the weights of shells follow a normal distribution. a random sample of 12 hybrid shells a a mean weight of 1.7 pounds with standard deviation 0.24 pounds. Find a 95 % confidence interval level for the mean weight if the fall catch is within 0.1 pounds of

    asked by Lost37 on March 21, 2013
  28. math

    John drives to work each morning and the trip takes an average of µ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of σ = 5 minutes. For a randomly selected morning, what is the probability that John’s

    asked by Anonymous on March 4, 2013
  29. Statistics

    John drives to work each morning and the trip takes an average of μ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of σ = 5 minutes. For a randomly selected morning, what is the probability that John’s

    asked by Robbie on October 14, 2012
  30. Statistics

    John drives to work each morning and the trip takes an average of µ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of s = 5 minutes. For a randomly selected morning, what is the probability that John’s

    asked by Anonymous on November 13, 2016
  31. statistics

    The distribution of weekly salaries at a large company is right skewed with a mean of $1000 and a standard deviation of $350. What is the probability that the sampling error made in estimating the mean weekly salary for all employees of the company by the

    asked by Anonymous on June 18, 2013
  32. math (statistics)

    The following table shows the percentage of individuals in each age group who use an online tax program to prepare their federal income tax return. AGE ONLINE TAX PROGRAM (%) 18-34 16 35-44 12 45-54 10 55-64 8 65+ 2 Suppose a follow-up study consisting of

    asked by sarah on February 9, 2015
  33. statistics

    A runner has a average race time of 4.5 minutes with a standard deviation of 0.14. What time do 75% of his race times fall and what time would he have to achieve to be in the top 5% of his race times?

    asked by Ken on October 30, 2008
  34. math

    The physical plant at the main campus of a large state university receives daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a mean of 58 and a standard deviation of 11. Using the

    asked by Anonymous on November 30, 2015
  35. Statistics

    1 39 63 wind speed (km h ) –1 Measurements of wind speed on a certain island were taken over a period of one year. A box-andwhisker plot of the data obtained is displayed above, and the values of the quartiles are as shown. It is suggested that wind

    asked by Osa on March 30, 2015
  36. tempe

    An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would

    asked by Paul on March 5, 2013
  37. Statistics

    An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.5 years of age. If the standard deviation is assumed to be 4.1 years, find the probability that a random sample of 32 U.S. women would

    asked by Paul on March 5, 2013
  38. maths

    if i have k = 36.86 +/- 4.78 and v = 113 +/- 9.92 both using 95% confidence limits and no true values of k or v given am i right in saying that accuracy cannot be determined and that v is a more precise measurement my question was to comment on what can be

    asked by lucy on January 19, 2010
  39. Math

    Fifteen smart cars were randomly selected and the highway mileage of each was noted. The analysis yielded a mean of 47 miles per gallon and a standard deviation of 5 miles per galon. Which of the following would represent a 90% confidence interval for the

    asked by Arturo on March 29, 2015
  40. statistic

    A distribution of values is normal with a mean of 225.5 and a standard deviation of 3.2. Find the probability that a randomly selected value is greater than 222.6. P(X > 222.6) = Enter your answer as a number accurate to 4 decimal places. Answers obtained

    asked by moon on January 8, 2018
  41. Math

    The average monthly mortgage payment including principal and interest is $982 in the United States. If the standard deviation is approximately $180 and the mortgage payments are approximately normally distributed, find the probability that a randomly

    asked by Lesley on April 10, 2013
  42. Geography

    10. Which of the following best describes a nations resistance towards immigration despite having an aging population. A. The Japanese government discourages interracial couples and encourages homogeneity of the population. B. China implemented a one-child

    asked by Geog on October 27, 2015
  43. math

    A study has shown that 20.05% of all college textbooks have a price of $80 or higher. It is known that the standard deviation of the price is $10. What is the mean price of the college textbooks? Assume the price is normally distributed.

    asked by Math on May 25, 2011
  44. Statistics

    Some IQ scores are standardized with a mean of 100 and a standard deviation of 16. Using the 68-95-99.7 Rule, Determine: 1. What percent of people would have an IQ score of no more than 68. (2).What percent of people would have an IQ score of 100 or above.

    asked by Math help on February 25, 2008
  45. Math

    Assume a data set is normally distributed with mean 11 and standard deviation 3. If the data set contains 30 data values, approximately how many of the data values will fall within the range 8 to 14?

    asked by Shelagh on July 12, 2014
  46. stats

    a random sample of 20 prices for summer sleeping bags was taken with a sample mean $83.75 and a sample standard deviation of $29.97 a) find a 95% confidence interval for the mean price of all summer sleeping bags b)what is m i.e. what is the margin f

    asked by Anonymous on April 30, 2012
  47. stats

    The per capita consumption of coffee by people in the United States in a recent year was normally distributed, with a mean of 24.2 gallons and a standard deviation of 8.1 gallons. What proportion of people in the U.S. drink more than 20 gallons of coffee a

    asked by jackie on April 6, 2012
  48. statistics

    a random sample of 20 prices for summer sleeping bags was taken with a sample mean of $83.75 and a sample standard deviation of $29.97 a. Find a 95% confidence interval for the mean price of all summer sleeping bags. b. what is m i.e., what is the margin

    asked by julie on April 29, 2012
  49. science

    3. In a sample of 64 students given an examination in statistics, it is found that the mean weight is 57 kg with standard deviation 9 kg. Find : Ć i) The proportion of students weight 48-62 kg. Ć ii) The proportion of those less than 72 kg. Ć iii)

    asked by suhad on February 22, 2013
  50. Statics

    Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of 0.2 inches and a standard deviation of 0.05 inches. What proportion of woodlice have antenna lengths that are more than 0.23 inches? Round your answer to at

    asked by C. Fenwick on December 1, 2013
  51. statistics

    a rocket club makes its own rockets. The rockets go to a mean height of 1100 feet with a standard deviation of 60 feet. if the club fires 36 rockets, what is probability that the mean heights of the rockets will be greater than 1080p feet

    asked by eric on July 13, 2014
  52. algebra

    55% of the people in a town have brown eyes. you choose a random sample of 200 people to survey regarding their eye color. What is the mean and standard deviation of the proportion of people in your sample that have brown eyes?

    asked by Anonymous on January 16, 2011
  53. Stats

    The annual precipitation for one city is normally distributed with a mean of 28 inches and a standard deviation of 3.4 inches. Fill in the blanks. In 95% of the years, the precipitation in this city is between __________ and __________ inches. Apply the

    asked by Amy on September 26, 2014
  54. satistics

    Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of 0.2 inches and a standard deviation of 0.05 inches. What proportion of woodlice have antenna lengths that are more than 0.27 inches? Round your answer to at

    asked by Anonymous on June 16, 2017
  55. Statistics

    In testing a new drug, researchers found that 20% of all patients using it will have a mild side effect. A random sample of 25 patients using the is selected. Find the mean and standard deviation of patients having a mild side effect. I know the mean is

    asked by Jasmine on June 21, 2018
  56. math

    The population of town N increases every year by 2%. What will be the population of this town in 3 years if it is currently nine hundred thousand people. (Round the answer to a whole number.)

    asked by ben on May 29, 2017
  57. Math

    the current population of a city is 45000 and is increasing according to P=45000(1+t)^n and n=number of years. if the rate of increase is 7.5% how long will it take the population to double?

    asked by Craig on April 25, 2016
  58. Math

    The population, P (in thousands), of a town can be modeled by P= 2|t-6|+4, where t=0 represents 1990. During which two years does the town have a population of 8000? Can someone show me the steps to this problem?

    asked by Cassie on October 5, 2011
  59. Statistics

    If the mean family size is 4.75 what is the total population of a city of 25000 families? Is it correct if I calculate it as follows: Mean: (x : 25000) = 4.75 Mean: x = 118750 number of population

    asked by Pavlos Cs on April 9, 2011
  60. math

    The population of town N increases every year by 2%. What will be the population of this town in 3 years if it is currently nine hundred thousand people. (Round the answer to a whole number.) Please help

    asked by ben on May 29, 2017
  61. math

    A population is increasing according to the exponential function defined by y = 2e0.02x, where y is in millions and x is the number of years. How large will the population be in 3 years?

    asked by Brad on August 1, 2012
  62. math

    an initial population of 865 quail increases at a annual rate of 15%. write an exponential function to model quail population

    asked by nick on February 20, 2014
  63. science

    . In which regions of the world will most population growth occur during the twenty-first century? What conditions contribute to rapid population growth in these locations?

    asked by Tony on June 25, 2010
  64. statistics

    In a population of N = 10 scores, the smallest score is X = 8 and the largest score is X = 20. Using the concept of real limits, what is the range for this population? a. 11 b. 12 c. 13 d. cannot be determined without more information

    asked by Lyn on December 26, 2013
  65. Math

    The population, P (in thousands), of a town can be modeled by P= 2|t-6|+4, where t=0 represents 1990. During which two years does the town have a population of 8000? Can someone show me the steps to this problem?

    asked by Cassie on October 6, 2011
  66. algebra

    the population of a city is expected to triple every 25 years . when can the city planners expect the present population of 180 persons to double?

    asked by mary on April 4, 2012
  67. econmics

    Topic is medical care for the aging population. My question is cutting cost through educational programs with solutions for the aging population? Help

    asked by sue on July 18, 2013
  68. Statistics

    The distribution of weekly salaries at a large company is reverse J-shaped with a mean of $1000 and a standard deviation of $370. What is the probability that the sampling error made in estimating the mean weekly salary for all employees of the company by

    asked by Janet on April 13, 2015
  69. Statistics

    Suppose that the weight of male babies less than 2 months old is normally distributed with mean 11.5 pounds and standard deviation 2.7 pounds. A sample of 36 babies is selected. What is the probability that the average weight of the sample is less than

    asked by Tommy on October 6, 2015
  70. Statistics

    A filing machine designed to fill soda bottles with 16 ouncesof soda. The distribution for the weight of the bottles is normal. Twenty bottles are selected and weighted. The sample mean is 15.3 ounces and the standard deviation is 1.5 ounces . Develop a

    asked by Leslie Meagan on January 3, 2015
  71. Algebra 2

    A simple random sample of 50 adults was surveyed, and it was found that the mean amount of time that they spend surfing the Internet per day is 54.2 minutes, with a standard deviation of 14.0 minutes. What is the 99% confidence interval for the number of

    asked by Jasmine on December 9, 2014
  72. statistics

    Using the central limit theorem, construct a 95% confidence interval for the average total cry time for infants in the control group and infants in the intervention group. For this question only, assume that the standard deviation of cry time within each

    asked by Gavin on January 21, 2013
  73. Statistics

    A survey among freshmen at a certain university revealed that the number of hours spent studying the week before final exams was normally distributed with mean 25 and standard deviation 15. A sample of 36 students was selected. What is the probability that

    asked by Anonymous on June 20, 2013
  74. MATHS

    The population of town A increases from 1,346 to 1,500. In the same period, the population of town B increases from 1,546 to 1,800. a. Find the percent of increase in population for town A and for town B. b. Which town had the greater percent of increase?

    asked by Lily on December 6, 2012
  75. Stats

    a raw score on a particular intelligence test is known to be approximately normally distributed in a population of 4th graders, with a mean of 95 and variance 81. which score has the property that there are 15% of scores in the population that are above

    asked by Jason on July 15, 2011
  76. math

    a countrys population in 1991 was 114 million in 1997 it was 120 million. estimate the population in 2014 using the exponential growth formula.

    asked by abigail vazquez on October 11, 2016
  77. Math

    gapeach69 The population of a city is 45,000 and decreases 2% each year. If the trend continues, what will the population be after 15 yrs? A) about 14,746**** B) about 33,236 C) about 41,000 D) about 47,504

    asked by Fira on March 1, 2017
  78. stats

    You are given the following information obtained from a random sample of 4 observations. 25 47 32 56 At a .05 level of significance, determine whether or not the mean of the population from which this sample was taken is significantly different from 48.

    asked by sara on December 1, 2010
  79. statistics

    If you want to be 95% confident of estimating the population proportion to within a sampling error of and there is historical evidence that the population proportion is approximately 0.40, what sample size is needed?

    asked by Johniece McCoy on March 16, 2012
  80. exponential equations

    Listeria has a current population of 400 organisms. After 72 minutes the population increased to 6400 organisms. Calculate the doubling time, d, of the bacteria.

    asked by Anonymous on April 8, 2015
  81. Math

    A population of 75 foxes in a wildlife preserve quadruples in size every 15 yr. The function y= 75 * 4^x , where x is the number of 15 yr periods, models the population growth. How many foxes will there be after 45 years?

    asked by Casey on March 7, 2013
  82. Math

    The population of a town increases by 25% during 1991. By what percent must it decrease the following year to return to the population it was at the beginning of 1991? I thought the answer was 25% but i don't know for sure.

    asked by Sai on December 18, 2016
  83. Geography

    What happened to the population of New Orleans during and after Hurricane Katrina? People stayed to protect property. People evacuated and returned slowly. People evacuated, but almost all returned. People evacuated and did not return. C is false, the

    asked by Anonymous on November 23, 2015
  84. Statistics

    What are the grand mean, the UCL and the LCL of a control chart for the mean? Why do you suppose + (with underline) standard errors are used in control charts and not two standard errors or even one standard error?

    asked by Crystal on June 30, 2008
  85. math

    A country seen its population grow each year in the eighth of what it was the previous year. At that time the population is successfully a. duplicate b. triplicate

    asked by Jessy on June 10, 2014
  86. Math

    A population of 250 frogs increases at an annual rate of 22%. a. Write an exponential function to model the population of frogs.

    asked by Algebra 2. Help, PLEASE! on March 27, 2011
  87. Math

    If the current population is 7,361,920,000 and grows at approximately 1.14% per year, what will the human population be this time next year?

    asked by Anonymous on August 23, 2015
  88. Math

    If the current population is 7,361,920,000 and grows at approximately 1.14% per year, what will the human population be this time next year?

    asked by Anonymous on August 23, 2015
  89. MATH!

    the 2000 population of Jacksonville,Florida was 736,000 and was increasing at the rate of 1.94% each year. At that rate, when will the population be 1 million?

    asked by hana on January 14, 2013
  90. Algebra

    A countrys population in 1995 was 56 million in 2002 it was 59 million. Estimate the population in 2016. Exponential growth formula

    asked by Anonymous on September 26, 2016
  91. Algebra

    A certain city has a population of 30000 and increases by 6% per year. What will the population be 7 years later? Select one: a. 42000 b. 45109 c. 156000 d. Over 156000

    asked by Anonymous on February 20, 2019
  92. Algebra 1

    The growth of the population of a country can be modeled by the equation . Using this equation, which of the following best represents the number of years it will take for the population of the city to double?

    asked by Jamie Ciacico on August 14, 2015
  93. geography

    compare latin america's landmass and population to those of the united states. Based on that data, how might the overall population densities of the two compare?

    asked by christina on January 25, 2010
  94. trig

    A population of wolves in a country is represented by the equation P(t)= 80(0.98)^t, where t is the number of years since 1998. predict the number in the population in the year.

    asked by lhencham on February 1, 2010
  95. Calculus

    Suppose the population of a colony of ants grows at the rate: P’(x) = 1 + 5/sqroot(t+1) If there are 250 ants after 120 hours, what was the population at t=0?

    asked by Shawes on April 3, 2018
  96. math

    The function f(t) = 24,500(0.84)  models the population of a town t years after 2008. What rate is the population of the town decreasing each year? A. 16% B. 24.5% C. 75.5% D. 84%

    asked by kelly on June 6, 2018
  97. Calculus

    Suppose the population of a colony of ants grows at the rate: P’(x) = 1 + 5/sqroot(t+1) If there are 250 ants after 120 hours, what was the population at t=0?

    asked by Shane on April 1, 2018
  98. statistics

    List below are the duration (in hours) of a simple random sample of all flights of a space shuttle program. Find the range, variance, and standard deviation for the sample data. Is the lowest duration time unusual? Why or hwy not? 73 95 238 199 166 268 198

    asked by angela on October 29, 2013
  99. Stats

    In a study of children with a particular disorder, parents were asked to rate their child on a variety of items related to how well their child performs different tasks. One item was "Has difficulty organizing work," rated on a five-point scale of 0 to 4

    asked by Hunter on March 29, 2015
  100. U.S History

    Case Study: General Andrew Jackson: Andrew Jackson's military career spanned several wars including the American Revolution, the Creek War, the War of 1812, and the First Seminole War. After the Creek War, Jackson and the Creek Indians signed the Treaty of

    asked by katrina on December 5, 2016