1. environmental science

    i really need help : thanks using the highest growth rate of 4.4 and beginning with the 1970 population of 584,000 calculate the population of Botswana in 2000 and project it for 2050. use the formula N=N0(zero is the bottom of the N) * e^kt. how many more

    asked by annaiiz on October 12, 2009
  2. statistics

    A survey is being planned to determine the mean amount of time corporation executives watch television. A pilot survey indicated that the mean time per week is 13 hours, with a standard deviation of 2.5 hours. It is desired to estimate the mean viewing

    asked by Anonymous on September 13, 2014
  3. Statistics

    Suppose Tori has an unfair coin which lands on Tails with probability 0.28 when flipped. If she flips the coin 10 times, find each of the following: Question 5 options: P(No more than 3 Tails) P(Exactly 1 Tail) P(At least 5 Tails) P(Less than or equal to 2

    asked by Anonymous on June 2, 2013
  4. immediate help needed statistics one tailed hypo

    the average weekly earnings of a production worker were $424. to know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation

    asked by Anonymous on July 19, 2010
  5. statistics

    A 4 to 7 month old baby sleeps an average of 14 hours per day. At this age, babies sleep patterns follow normal distribution with the standard deviation of 1.6 a) is it unusual for a baby to sleep under 12 hours aday? b) In a random sample of 10 babies of

    asked by adriana on November 30, 2014
  6. Statistics

    Solve this statistic question? A survey of 250 lobster fishermen found that they catch an average of 32.0 pounds of lobster per day with a standard deviation of 4.0 pounds. If a random sample of 36 lobster fishermen is selected, what is the probability

    asked by Anonymous on June 7, 2018
  7. Algebra - please check my answer for me

    The population increased 80 percent in 5 years. The current population is 18,000. find five years ago. 18,000 * 0.80 = 14,400 18,000 - 14,400 = 3,600 3,600 is the population five years ago? to check: 3,600 * 5 = 18,000 Is 3,600 the correct answer. Was this

    asked by Terence P. on September 3, 2007
  8. Biology

    If 20% of the individuals in a population have sickle-cell anemia, according to the Hardy Weinberg equation, what proportion of the population should be sickle-cell carriers?

    asked by Tammy on February 24, 2019
  9. Statistics for Behavioral Sciences

    A disease affects 9% of individuals in a population and a sample of 100 people is selected from the population. What is the probability of finding the disease in 15 people?

    asked by Lindz on June 11, 2012
  10. Math

    The population in a town of 40,000 is growing by 12% per year. How long will it take the population to grow to 230,000? Round to the nearest year.

    asked by Ehab on September 11, 2017
  11. algebra

    A population of wolves in a county is represented by the equation P(t)=80(0.98)^t, where t is the number of years since 1998. What will be the number of wolves in the population in the year 2012?

    asked by clarissa on April 30, 2015
  12. Math

    The population of some countries has a relative growth rate of 2.75% per year. At this rate, how many years (to the nearest tenth of a year) will it take the population to double?

    asked by Anonymous on April 21, 2014
  13. Trigg

    In a predator/prey model the predator population is modeled by the function y=1000 sin (2t) +400. What is the smallest population according to this model?

    asked by Jenny on March 17, 2014
  14. History

    The population of the United States A. is less than Canada's. B. is a tenth of Canada's population. C. is nearly ten times larger than Canada's. D. is equal to Canada's. I think C or A or D. I need help fast!!!

    asked by Anonymous on January 20, 2015
  15. Statistics #3

    The estimate of the population proportion is to be within plus or minus .10, with a 99 percent level of confidence. The best estimate of the population proportion is .45. How large a sample is required?

    asked by Monique on June 11, 2008
  16. Math

    The population of some countries has a relative growth rate of 2.75% per year. At this rate, how many years (to the nearest tenth of a year) will it take the population to double?

    asked by Anonymous on March 30, 2014
  17. statistics

    The international bottled water association says that Americans on the average drink 4.6 (8oz) servings of water a day. Assume that the number of 8oz. servings of water is approximately normally distributed with a standard deviation of 1.8 servings what

    asked by irene on September 17, 2013
  18. statistics

    I am having trouble figuring out how to do this type of problem. Here is the current problem I am working on: the probability that a tomato seed will germinate is 60%. A gardener plants in batches of 12. A.) what is the probaility that exactly 10 seeds

    asked by Pam on January 2, 2010
  19. Statistics

    Assume that the average annual salary for a worker in the United States is 300,000- and that the annual salaries For Americans are normally distributed with a standard deviation equal to $7,000. Find the following: A. What percentage of Americans earn

    asked by Ann on October 14, 2012
  20. statistics

    In one history class, 34 students took an exam. The mean of the exam was 52 with a standard deviation of 13. If the instructor is going to assume data are normally distributed and assign grades on a curve, then she will assign an A to the top 10% of the

    asked by melissa on November 29, 2010
  21. MBA

    1- The height of adult women in the United States is normally distributed with mean 64.5 inches and standard deviation 2.4 inches. Find the probability that a randomly chosen woman is (a) Less than 63 inches tall (b) Less than 70 inches tall (c) Between 63

    asked by Bunkym on March 25, 2014
  22. statistics

    Suppose that the heights of adult men in the United States are normally distributed with a mean of inches and a standard deviation of inches. What proportion of the adult men in United States are more than feet tall? (Hint: feet inches.) Round your answer

    asked by Anonymous on October 1, 2010
  23. statistics

    Suppose that the heights of adult men in the United States are normally distributed with a mean of inches and a standard deviation of inches. What proportion of the adult men in United States are more than feet tall? (Hint: feet inches.) Round your answer

    asked by Demeisa on February 7, 2011
  24. Investments Analysis

    Can anyone help with ANY of these? Any good starting points would be great! Alpha (STI) 0.90 2008 Return(STI) 15% Beta(STI) 1.20 2008 Return(INX) 10% R_squared 36% Risk Free Rate 4% Variance(STI) .1296 b. What is the relative volatility (variability) of

    asked by James on March 6, 2010
  25. Calculus 1

    The number of yeast cells in a laboratory culture increases rapidly initially but levels off eventually. The population is modeled by the function n = f(t) = a/(1 + be^−0.5t) where t is measured in hours. At time t = 0 the population is 10 cells and is

    asked by TayB on October 5, 2015
  26. Math; Statistic

    At peak periods, 15% of attempted log-ins to an email service fail. Log-ins attempts are independent and each has the same probability of failing. Ann logs in repeatedly until she succeeds. A. find the probability that Ann needs to log in at least four

    asked by Jerome on April 12, 2017
  27. Help Math!

    Battery Power Problem. A certain type of thermal battery for an airplane navigation device backup power has a mean life of 300 hours with a standard deviation of 15hours. What proportion of these batteries can be expected to have lives of 322 hours or

    asked by Mariah on May 19, 2010
  28. math

    To qualify for a special program at university, sharma had to write a standardized test. The test had a maximum score of 750, with a mean score of 540 and a standard deviation of 70. Scores on this test were normally distributed. Only those applicants

    asked by jessica on November 5, 2016
  29. Statistic

    At peak periods, 15% of attempted log-ins to an email service fail. Log-ins attempts are independent and each has the same probability of failing. Ann logs in repeatedly until she succeeds. A. find the probability that Ann needs to log in at least four

    asked by Eric on April 11, 2017
  30. STATS

    The top selling Red and Voss tire is rated 70,000 miles means nothing. In fact, the distance the tires can run until they wear out is a normally distributed random variable with a mean of 82,000 miles and a standard deviation of 6,400. a. What is the

    asked by SANDRA on September 16, 2011
  31. History

    Which best describes how the Columbian Exchange impacted the Incan culture? european powers introduced the potato to the Inca empire, and it became a primary food source european infected the Inca population with syphilis, which Inca believed to be an act

    asked by malia on October 21, 2017
  32. Statistics

    A manufacturer of sports equipment claims that the new fishing line has a mean breaking strength of at least 8 kilograms. Test this claim if a sample of 28 lines found that the mean breaking strength is 7.8 Kg with sample standard deviation 0.5 Kg. The

    asked by Kori on December 8, 2011
  33. math (Please help me out)

    An insurance company is reviewing its current policy rates.when originally setting the rates they believed that the average claim amount was 1800.00.they are concerned that the true mean is actually higher than this,because they could potentially lose a

    asked by Ras on May 14, 2016
  34. homework statistics

    Consider a random sample with sample mean x. If the sample size increased from n = 40 to n = 360, then the standard deviation of x will: a. remain the same b. increase by a factor of 9 (will be multiplied by 9) c. decrease by a factor of 9 (will be

    asked by Jackay 70 on July 22, 2011
  35. Statistics

    The time required to make 900 gallons of synthetic rubber at a plant in South America in a recent year was normally distributed with a mean of 15 hours and a standard deviation of 2.5 hours. What is the probability that it will take more than 17 hours to

    asked by Clyde on February 25, 2011
  36. Maths

    Metal components for a machine have lengths which are normally distributed with mean 8 cm and standard deviation 4 cm. A) the longest 10% of components require filling down. What is the smallest length of component which require filing down? B) the

    asked by Anonymous on March 3, 2016
  37. STAT

    Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9, we are to perform the following hypothesis testing: Null Hypothesis H0 : µ = 700 Research Hypothesis H1 : µ ≠ 700 •What is the test statistics? •At a 0.05

    asked by Jacky on October 12, 2013
  38. STAT

    Given a sample size of 18, with sample mean 660.3 and sample standard deviation 95.9, we are to perform the following hypothesis testing: Null Hypothesis H0 : µ = 700 Research Hypothesis H1 : µ ≠ 700 •What is the test statistics? •At a 0.05

    asked by Jacky on October 13, 2013
  39. statistics

    A new extended-life light bulb has an average service life of 750 hours, with a standard deviation of 50 hours. If the service life of these light bulbs approximates a normal distribution, about what percent of the distribution will be between 600 hours

    asked by MARIA on January 9, 2012
  40. statistics

    2. The results of a recent survey indicate that the average new car costs $23,000, with a standard deviation of $3,500. The price of cars is normally distributed. a. What is a Z score for a car with a price of $ 33,000? b. What is a Z score for a car with

    asked by Sandra on September 3, 2012
  41. statistic

    You draw a random sample of 300 employee records from the personnel file and find that the average years of service per employee is 6.3, with a standard deviation of 3.0 years. a. What percentage of the workers would you expect to have more than 9.3 years

    asked by carp; on May 11, 2010
  42. Statistics- PEASE help!

    Subjects Art Business Computers English Foreign Languages Health Home Economics Mathematics Music Physical Education Science Social Studies Features Contribute Download Experts Forum Job Openings Homework Tips Libraries.Jiskha Link to Us Reference School

    asked by Laura on November 2, 2007
  43. Statistics

    Please can some one help me with the following: A fisherman finds that approximately 17% of all his fish go bad by the time he takes them to the market. The fisherman catches 1,000 fish. A. How many will go bad by the time he takes them to the market? B.

    asked by Alia on December 25, 2012
  44. Statistics

    Please can some one help me with the following: A fisherman finds that approximately 17% of all his fish go bad by the time he takes them to the market. The fisherman catches 1,000 fish. A. How many will go bad by the time he takes them to the market? B.

    asked by Alia on December 26, 2012
  45. Math

    If the size of a population is N and the size of a sample of the same population is n, then the correct relationship between N and n is

    asked by Marilyn on September 3, 2008
  46. economics

    1. What are the three types of population? 2. Give a graphic description of the three types of population.

    asked by kemi on December 31, 2014
  47. Math

    The table below shows the populations of four countries for the year 2006 expressed in scientific notation. Population in 2006 Country Population Lebanon 3.90 × 106 Mexico 1.08 × 108 Peru 2.84 × 107 Spain 45.5 × 106 Of the countries listed, which one

    asked by Mariana on November 2, 2016
  48. AP Statistics

    Suppose a Normal model describes the fuel efficiency of cars currently registered on your state. The mean is 24 mpg, with a standard deviation of 6 mpg. -Describe the fuel efficiency of the worst 20% of all cars. I know that you convert 20% into decimal

    asked by Courtney on November 9, 2007
  49. stats

    Homeowners claim that the mean speed of automobiles traveling on their street is greater than the speed limit of 35 miles per hour. A random sample of 120 automobiles has a mean speed of 37 miles per hour and a standard deviation of 4 miles per hour. Using

    asked by Anonymous on April 9, 2016
  50. Statistics/Probability

    Each day a bakery delivers the same number of loaves of bread to local shop on the corner. On average the shop sells 75% of loaves. Assuming that the number of loaves sold per day has binomial distribution with a standard deviation of 9. Find the number of

    asked by Koylar on July 17, 2014
  51. math

    a potato chip manufacturer has been accused of shortchanging their customers with 10 ouce of bags potato chips. a sample of 50 of that company's 10 ounce bags was take, and it was found that the average weight was 9.8 ounces with a standard deviation of

    asked by kiki on April 25, 2013
  52. Statistics

    A person's level of blood glucose and diabetes are closely related. Let x be a random variable measured in milligrams of glucose per deciliter (1/10 of a liter) of blood. Suppose that after a 12-hour fast, the random variable x will have a distribution

    asked by Alex on June 20, 2010
  53. statistics

    Select which of the following are examples of parameters from these examples. Question options: The probability that a ticket with be a winner is .2 (or a 20% chance) The proportion of winning tickets in the sample of 100 99% of samples will have between

    asked by Anonymous on June 29, 2014
  54. math

    A researcher collated data on Americans’ leisure time activities. She found the mean number of hours spent watching television each weekday to be 2.7 hours with a standard deviation of 0.2 hours. Jonathan believes that his football team buddies watch

    asked by faa on November 20, 2016
  55. pre calc

    The following polynomial approximates the rabbit population in a particular area.? R(x)= -0.121x^5+2.952x^4+3500, where x is the number of years frm 1975. use a graphing calculator to describe the rabbit population from the rears 1975 to 1990. how do you

    asked by wally on October 22, 2014
  56. Math

    Dover's current population is 5,074 residents, which is 14% smaller than at the time of its founding. What was the population of Dover back then? I'm sorry, there's another question on IXL I need some help on, I'm just wondering if I'm right, am I? First I

    asked by Angie on August 4, 2017
  57. Math

    The average travel time to work for a person living and working in​ Kokomo, Indiana is 19 minutes. Suppose the standard deviation of travel time to work is 4.5 minutes and the distribution of travel time is approximately normally distributed. What is the

    asked by .... on October 25, 2017
  58. Math

    The average travel time to work for a person living and working in​ Kokomo, Indiana is 17 minutes. Suppose the standard deviation of travel time to work is 4.5 minutes and the distribution of travel time is approximately normally distributed. What is the

    asked by Promise on October 24, 2017
  59. math

    A town has a population of 32,000 in the year 2002; 35,200 in the year 2003; 38,720 in the year 2004; and 42,592 in the year 2005. If this pattern continues, what will the population be in the year 2016?

    asked by Brittany on March 10, 2012
  60. statistics

    4. A large company insists that all job applicants who are invited for an interview take a psychometric test. The results of these tests follow a normal distribution with a mean of 61% and a standard deviation of 7.2%. a) What proportion of applicants

    asked by victor on November 5, 2011
  61. Precalculus

    please write an equation in standard x^2-y^2-2x+4y-7=0 * standard form *center *vertices *foci *asymptotes Thank-you you

    asked by Vince on December 3, 2014
  62. Stats

    The Ledd Pipe Company has received a large shipment of pipes, and a quality control inspector wishes to estimate the average diameter of these pipes. A random sample of 18 pipes produces an average diameter of 2.56 mm with a standard deviation of 0.05 mm.

    asked by Matt on November 28, 2012
  63. 12th grade Math - word problems

    #1.) The population of bacteria after t hours is given by P(t) = 500/(1+83.33e^-0.162t) a.) What is the initial population? b.) When will the amount of bacteria in the population be 12? #2.) Which investment yields the greater amount after 4 years? a.)

    asked by Jamie on September 20, 2010
  64. stats

    (a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The distribution is Normal because the

    asked by Anonymous on September 26, 2016
  65. stats

    (a) The test had six multiple-choice items that were scored as correct or incorrect, so the total score was an integer between 0 and 6. Do you think that these data are Normally distributed? Explain why or why not. The distribution is Normal because the

    asked by Anonymous on September 26, 2016
  66. Statistics 15.59

    Computer database GROWCO describes the characterisitics of 100 companies identified by Fortune as the fastest growing. Two of the variables listed are revenue and net income (millions of dollars) for the most recent four quarters. Determine the linear

    asked by Julia Brown on June 16, 2010
  67. Word Problem Question

    I would like to know if I am correct, so far. The amount P of pollution varies directly with the population N of people. City A has population of 494,400 and produces 260,000 tons of pollutants. Find how many tons of pollution we should expect City B to

    asked by kai on December 16, 2011
  68. Chem

    Calculate the standard cell potential given the following standard reduction potentials: Al3++3e−→Al;E∘=−1.66 V Fe2++2e−→Fe;E∘=−0.440 V

    asked by Allen on May 18, 2014
  69. Chem

    Can someone explain the difference or how to tell between internal/external standard, standard addition and how it relates calibration standards?

    asked by Ano on December 13, 2011
  70. chemistry

    Why is the standard reduction potential E, for the standard hydrogen electrode 0.00V? Please help me explain the reason why to this problem

    asked by jennifer on May 22, 2008
  71. BioChem

    If you run an unknown sample and it is darker than your highest standard on your standard curve, what do you report as the concentration?

    asked by Dreamland11 on October 31, 2011
  72. Chemistry

    How do I find the pH of pure neutral H2O at o degrees celsius by using standard enthalpies and standard entropies

    asked by Tanya on April 21, 2011
  73. chemistry

    Why is the standard reduction potential E, for the standard hydrogen electrode 0.00V? Please help me explain the reason why to this problem

    asked by kristine on May 22, 2008
  74. chemistry

    Is deltaH standard of TdeltaS standard more important in determining whether KHT will be soluble in water at a given temperature?

    asked by Gracie on February 25, 2014
  75. stats

    A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the

    asked by Alex on October 29, 2014
  76. statistics

    At a large dept. store, the avg. number of years of employment for a cashier is 5.7 with a standard deviation of 1.8 years. If the number of years of employment at this department store is normally distributed, what is the probability that a cashier

    asked by Kelly on January 4, 2013
  77. statistics

    A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the

    asked by Anonymous on October 29, 2014
  78. statistics

    A company wishes to make 1 ounce candy bars. According to government regulations, in order to label the candy bars as 1 ounce, at least 95 % of the bars must weigh 1 ounce or more. Our process standard deviation is .08 ounces. What do we need to make the

    asked by Anonymous on October 30, 2014
  79. Physics

    An average family of four uses roughly 1200 liters (300 gallons) of water per day. (One liter = 1000 cm^3.) How much depth would a lake lose per year if it uniformly covered an area of 50 square kilometers and supplied a local town with a population of

    asked by Zack on August 10, 2009
  80. Geography

    1. All of the following explain negative geographical health influences on population expect....... A.High Infant mortality in Haiti B. Poor sanitation in Sub-Saharan Africa C. Destroyed hospitals in war-torn regions of the Middle East. D. Aging population

    asked by Geo on November 5, 2015
  81. statistics

    The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren

    asked by Renee on June 23, 2008
  82. statistics

    It is claimed that an automobile is driven on the average more than 20,000 kilometers per year. Random sample of 10 automobile owners are asked to keep a record of the kilometers they travel. If the sample mean and standard deviation of automobile driven

    asked by Ali on June 3, 2011
  83. Statistics NEEED YOUR HELP ASAP!!!!!!!!!!!!!!

    The manufacturer of the X-15 steel-belted radial truch tire claims that the mean mileage the tire can be driven before the tread wears out is 80,000 km. The standard deviation of the mileage is 8,000 km. The Crosset Truck Company bought 48 tires and found

    asked by Samir on April 3, 2010
  84. statistics

    An accounting firm is planning for the next tax preparation season. From last year's returns, the firm collects a systematic random sample of 100 filings. The 100 filings showed an average preparation time of 90 minutes with a standard deviation of 140

    asked by SHA on November 19, 2011
  85. statistics

    B} The average number of mosquitoes in a stagnant pond is 70 per square meter with a standard deviation of 8. If 36 square meters are chosen at random for a mosquito count, find the probability that the average of those counts is more than 70.9 mosquitoes

    asked by Loren on November 12, 2014
  86. statistics and probability

    It is known that an exam scores of students in STAT 2507 follow a normal distribution with a mean of 70% and a standard deviation of 9%. (A) If a student must obtain a mark of 50% to pass the exam, what proportion of students fail the exam? (B) What is the

    asked by Adam on February 26, 2011
  87. Biology - population growth

    Two yeast cells were placed into a special container to which food was continually added, to keep it at a constant concentration. All other factors were set for optimal yeast growth (for example, temperature, oxygen, and pH). The population was sampled

    asked by Maria on January 24, 2019
  88. math

    The image of the public library is constantly changing, and their online services continue to grow. Usage of the library's home page grew by 17% during the past 12 months. It has been estimated that the current average length of a visit to the library's

    asked by Sue 8 on June 21, 2013
  89. statistics/probability

    QUESTION- machines are used to pack sugar into packets supposedly containing 1.20kg each.on testing a large number of packets over a long perodof time ,it was found that the mean weight of the packets was 1.24kg and the standard deviation was 0.04kg. a

    asked by sunil on October 29, 2010
  90. pre algebra

    write an equation for the line through the given points or through the given point with the given slope (5,7),(6,8) (1,2),(3,8) (0,5),(-3,2) (8,11),(6,16) For each of them, use the standard formula (y- y1) = [(y2-y1)/x2-x1)]*(x-x1) In the first case, that

    asked by Anonymous on March 15, 2007
  91. statistics

    Women’s heights are normally distributed with a mean of 162 cm and standard deviation of 16 cm. a. Define an random variable, X, and describe its full distribution including the mean and variance. b. What percentage of heights are greater than 180 cm ?

    asked by Jasmine on December 4, 2011
  92. statistics z or t test

    the average weekly earnings of a production worker were $424. to know if wages, on average, have gone up since that time. To test this, you sample 64 production workers, and determine that their average salary is $432.69, with a sample standard deviation

    asked by Anonymous on July 19, 2010
  93. Science Question 1

    If our Sun was Population II, the solar system would contain no ________ planets. Since this is not my area of expertise, I searched Google under the key words "sun population II" to get these possible sources: http://en.wikipedia.org/wiki/Metallicity

    asked by Liz on March 5, 2007
  94. Statistics Emergency please

    People end up tossing 12% of what they buy at the grocery store (Reader's Digest, March 2009). Assume this is the true population proportion and that you plan to take a sample survey of 540 grocery shoppers to further investigate their behavior. a)What is

    asked by Vanessa on April 17, 2014
  95. Calc

    The U.S. population is approximated by the function P(t) = 556 1 + 3.72e−0.5t where P(t) is measured in millions of people and t is measured in 30-year intervals, with t = 0 corresponding to 1930. What is the expected population of the United States in

    asked by Liz on July 19, 2012
  96. math

    According to the US Bureau of the Census, the world population in the year 1950 was A=2555360972, and in 2000 it was B=6079006982. We'll use A and B so we don't have to keep writing those large and idiosyncratic numbers. We usually use y and x in the

    asked by Anonymous on January 23, 2015
  97. biology (multiple choice!)

    The death by bubonic plague of about 1/3 of Europe's population during the fourteenth century is a good example of: A. Abiotic factors limiting population size B. A density dependent effect C. A time lag D. A density-independent effect E. Carrying capacity

    asked by Sarah on September 22, 2010
  98. math

    In a wildlife preserve, a random sample of the population of 150 raccoons was caught and weighed. The result, given in pounds, were 17,19,20,21,23,27,28,28,28 and 32. Jean made the qualitative statement, "The average weight of the raccoon population is 25

    asked by Tim on February 25, 2016
  99. math

    Express Courier Service has found that the delivery time for packages is normally distributed with mean 14 hours and standard deviation 2 hours. What should be the guaranteed delivery time on all packages in order to be 95% sure that the package will be

    asked by Jessica on January 21, 2013
  100. statistics

    a) What is the standard deviation of the set of data? b) What raw score will have 15% of the data set above it? c) If I have a raw score of 21 what percentage of the scores, are below my score? 16, 16, 89, 76, 24, 45, 98, 20, 22, 28, 34, 35, 76, 67, 48, 37

    asked by anika on October 11, 2014