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November 24, 2014

Homework Help: Math: Statistics

Recent Homework Questions About Statistics

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statistics
Four girls (say I, II, III and IV) are to rank 3 different types of cake (say A, B and C) in a blindfold test. Each girl ranks the three cakes as 1 (for the cake she likes the best), 2 and 3, and then the assigned ranks of each type of cake are summed. Assume that each girl is...
Wednesday, August 27, 2014 at 6:29am

Statistics
use the stem-and leaf plot below to answer questions 11-13. Assume that 30/0=300 30/0 31/2 2 32/1 5 33/0 3 6 34/4 5 7 8 35/1 1 2 9 How many numbers are in the original data set? 6 16 22 9 What is the largest number in the data set? 9 22 35 359 If this data were put into a bar ...
Tuesday, August 26, 2014 at 2:31pm

statistics
The number of new boats sold at a boat dealership in a given week qualitative/nominal qualitative/ordinal quantitative/continuous quantitative/discrete the weight of a gemstone qualitative/nominal qaulitative/ordinal quantitative/continuous quantitative/discrete The make of a ...
Tuesday, August 26, 2014 at 12:00pm

statistics
According to a survey, only 20% of customers who visited the web site of a major retail store made a purchase. Random samples of size 50 are selected.Tthe mean of all the sample proportions of customers who will make a purchase after visiting the web site is _
Monday, August 25, 2014 at 11:27am

Statistics
Assume that a procedure yields a binomial distribution with a trial repeated n times. Use the binomial probability formula to find the probability of x successes given the probability of success on a single trial, n=9, x=2, p=0.35.
Monday, August 25, 2014 at 5:34am

statistics
The selling of prices Of six second hand bicycles in relation to their ages were noted for advertisements appearing in a local newspaper . The details are given in the table bellow. Age x ( years) 4 10 2 1 3 4 Price, y. 9 1 14 18 12 7 ( a) calculate the value of the product - ...
Saturday, August 23, 2014 at 6:11pm

statistics
A study is being made of the failures of an electronic component. There are four types of failures possibly and two mounting positions for the device. The following data have been taken; FAILURE A. B. C. D M. Position 1 22 46 18 9 M. Position 2. 4 17 6 12 Test the hypothesis ...
Saturday, August 23, 2014 at 5:59pm

statistics
In a certain city, a fast food chain feels it is giving a bad reputation because it takes too long to serve the customer. Since the chain had four restaurants in this town, it is concerned with whether all restaurants have the same average servicing time. One of the owners of ...
Saturday, August 23, 2014 at 5:48pm

statistics
Your muffler factory claims to manufacture mufflers with a lifespan of more than 10000 miles of usage. A consumer group tests this claim at the 95 percent significance level, and finds that a sample of 64 mufflers have a mean lifespan of 10002 miles, with a standard deviation ...
Saturday, August 23, 2014 at 4:51pm

Statistics
The scores for math test #3 were normally distributed. If 15 students had a mean score of 74.8% and a standard deviation of 7.57, how many students scored above an 85%?
Friday, August 22, 2014 at 3:43am

statistics
The average weight of all newborn babies at Dearborn Hospital was estimated by using the average weight of babies born in the month of April. Based on this information, identify: a. A statistic b. A variable c. A data value
Friday, August 22, 2014 at 12:57am

statistics
A certain number of articles manufactured in a batch were classified into three categories according to some particular characteristic, being less than 50, between 50 and 60 and greater than 60. If this characteristic is known to be normally distributed, determine the mean and...
Thursday, August 21, 2014 at 8:35am

AP Statistics
A study sought to determine whether the ancient Chinese art of acupuncture could help infertile women become pregnant. 160 healthy women undergoing treatment for infertility were recruited for the study. Half of the subjects were randomly assigned to receive acupuncture ...
Wednesday, August 20, 2014 at 7:51pm

inferential statistics
A supplier of company X makes on an average of 5 defective pieces. The company accepts a sample if there are no more than 7 defective pieces. What are the chances that the company will reject the sample?
Tuesday, August 19, 2014 at 11:38pm

Business Statistics
You wish to learn the average age of an MBA student within 2 years and with 99% confidence. How large of a sample should you get? Based on data from student_data.xls This is what I have so far. I don't know what the standard deviation would be N= [ZS/E]^2 N= [ 2.5758*s/2] ^ 2
Tuesday, August 19, 2014 at 11:03pm

statistics
describe the distribution of the data with regard to the shape, outliers, center, and spread.
Tuesday, August 19, 2014 at 6:28pm

Statistics
suppose 60 people are asked which method is best to avoid getting the flu. the results are shown in the table below. determine the percentage for each method and complete the table. round to the nearest whole number. Method Frequency % Flu shot 15 washing hands 36 taking ...
Tuesday, August 19, 2014 at 6:01pm

statistics
The correct size of a nickel is 21.21 millimeters. Based on that, the data can be summarized into the following table: Too Small Too Large Total Low Income 19 21 40 High Income 22 13 35 Total 41 34 75 Q: If 100 children are chosen at random, it would be unusual if more ...
Tuesday, August 19, 2014 at 11:54am

statistics
Construct the cost of living index number for private university teacher for the year august 2014 considering august 2013 as the base period.
Tuesday, August 19, 2014 at 1:37am

statistics
If a milk cow in California produced a mean of 1,875 pounds of milk per month, what percentage of production would that cow be in compared to the overall production per milk cow in California from 1990 through 2005?
Tuesday, August 19, 2014 at 12:57am

statistics
population has mean 53 and standard deviation 12. Calculate the standard deviation of x bar for a random sample of size 12.
Monday, August 18, 2014 at 7:12pm

statistics
The number of hours that college students sleep on a week night is approximated by a normal curve with a mean of 7 hours and a standard deviation of 1.7 hours. Answer the question below using a z table: On a week night, what percentage of students sleep between 5 and 10 hours
Monday, August 18, 2014 at 9:27am

statistics
The number of vacation days taken by employees of a company is normally distributed with a mean of 14 days and a standard deviation of 3 days. For the next employee, what is the probability that the number of days of vacation taken is less than 10 days? More than 21 days?
Sunday, August 17, 2014 at 11:16pm

Statistics in Psychology
What is a proper Null and Alternative HypothesThe CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study ...
Sunday, August 17, 2014 at 7:12pm

Statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
Sunday, August 17, 2014 at 6:40pm

statistics
In performing a hypothesis test, the null hypothesis is population mean = 6.9 and the alternative hypothesis is population mean ≠ 6.9, a random sample of 16 items is selected. The sample mean is 7.1 and the sample standard deviation is 2.0. The population is ...
Sunday, August 17, 2014 at 8:09am

Research Statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees by employee job title. There were three job categories: clerical, custodial, and managerial. The study collected current salary data of the three groups ...
Saturday, August 16, 2014 at 1:29am

Statistics
Six homes are randomly surveyed from a group of fifteen homes. How many different random samples are possible
Thursday, August 14, 2014 at 3:15am

statistics
4. The average family income in the town of Seneville is $45 000, with a standard deviation of $9000. Assuming that family income is normally distributed, determine the income level below which 80% of the families in this town earn
Wednesday, August 13, 2014 at 8:28pm

statistics
You want to estimate the difference in grade point averages between two groups of university students to be accurate within 0.2 grade point, with probability approximately equal to 0.95. If the standard deviation of the grade point measurements is approximately equal to 0.6, ...
Wednesday, August 13, 2014 at 2:43pm

statistics
in a beach side suburb it rains on 20% of days and is windy on 30% of days. if rain and wind are independent, on any particular day find the probability that: (a) it rains and is windy (b) it does not rain and is not windy (c) it rains or it windy (d) it does not rain or is ...
Wednesday, August 13, 2014 at 12:28pm

statistics
1) One hundred clients of a registered tax agent fall into the categories of personal (25 male, 30 female), corporate (10 male, 15 female) and small business (8 male, 12 female). The agent selects one of the clients at random to begin work. Find the probability that the client...
Wednesday, August 13, 2014 at 11:33am

statistics
A research organization claims that the monthly wages of industrial workers in district X exceeds that of those in district Y by more than Rs 150. Two different samples drawn independently from the two district yielded the following results: District X: 1 x = 648, 2 1 s = 120...
Wednesday, August 13, 2014 at 9:21am

statistics
150 students is 60 kg the mean of body is 70 kg withstandard deviation of 10 kg and mean weight of girls is 55 kg with standard deviation of 15kg.calculate the number of boys and the combined standard deviation. Also find whether the coefficient of deviation is hired for girls...
Monday, August 11, 2014 at 3:51pm

statistics
Advertisers contract with Internet service providers and search engines to place ads on websites. They pay a fee based on the number of potential customers who click on their ad. Unfortunately, click fraud—the practice of someone clicking on an ad solely for the purpose ...
Monday, August 11, 2014 at 1:58am

statistics
Use the given sorted values below which are the numbers of points scored in the Super Bowl for a recent period of 24 years. 36 37 37 39 39 41 43 44 44 47 50 53 54 55 56 56 57 59 61 61 65 69 69 75
Sunday, August 10, 2014 at 10:34pm

statistics
Suppose that on a certain examination in advanced mathematics, students from University A achieve scores which are normally distributed with a mean of 625 and a variance of 100, and that students from University B achieve scores which are normally distributed with a mean of ...
Sunday, August 10, 2014 at 6:59am

Statistics
I need to perform a One Way Anova for the following numbers: Scores: are 1, 2, 3, 2,3,4,4,5,6 Group: are 1, 1, 1, 2,2,2,3,3,3 How do I do this? I have the format but I don't know what numbers to put in for the samples,
Saturday, August 9, 2014 at 3:20pm

statistics
A jar contains 2 red balls, 2 blue balls, 2 green balls and 1 orange ball. Balls are randomly selected, without replacement, until 2 of the same colour are obtained. Calculate the probability that more than 3 balls must be selected.
Thursday, August 7, 2014 at 12:13pm

statistics
The mean sleep time of babies is 14hrs,a sample of 64 babies showed a mean of 13hrs 30min with a standard deviation of 3hrs at 1% level of significance. Test the assertion that the mean sleep of the babies is less than 14hrs a day.
Thursday, August 7, 2014 at 12:02pm

statistics
The mean lifetime of a sample of 100 light tubes is 1570 hours with a standard deviation of 80 hours test the hypothesis that the mean lifetime of the tubes is 1600 hours
Thursday, August 7, 2014 at 11:34am

sTATISTICS
If light bulbs have lives that are normally distributed with a mean of 2500 hours and a standard deviation of 500 hours, approximately what percentage of light bulbs has a life of more than 3000 hours?
Thursday, August 7, 2014 at 4:40am

statistics
Suppose x is a uniform random variable with c=10 and d=60. Find the probability that a randomly selected observation exceeds 30.
Wednesday, August 6, 2014 at 9:07pm

statistics
You can answer any questions from the questions on an exam. In how many different ways can you choose the questions, assuming that the order in which you choose the questions is irrelevant?
Wednesday, August 6, 2014 at 7:25pm

Psyc, statistics
Introduction to Hypothesis Testing In an article entitled “Science and ethics in conducting, analyzing, and reporting psychological research” in the journal Psychological Science (1994), psychologist Robert Rosenthal examines the relationship between a researcher&#...
Wednesday, August 6, 2014 at 5:41pm

statistics
If 1,000 students take a test that has a mean of 40 minutes, a standard deviation of 8 minutes, and is normally distributed, how many would you expect would finish in between 24 and 48 minutes?
Wednesday, August 6, 2014 at 11:16am

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 standard deviation of...
Tuesday, August 5, 2014 at 1:59am

statistics
The students in your class with three children in their families are asked to state the number of boys in the family. What are the possible numbers? If X is the number of boys minus the number of girls in each of these families, state all the possible values of X. Make a table...
Monday, August 4, 2014 at 11:52pm

statistics
Kindergarten children have heights that are approximately distributed normal. A random sample of size 20 is taken and the mean x and the standard deviation s are calculated ( x = 40 inches and s = 3). a. Is there sufficient evidence to indicate that the mean of kindergarten ...
Sunday, August 3, 2014 at 6:52pm

statistics
The human resources department of an engineering company gives IQ tests to a randomly selected group of new hires every year. They claimed that the mean IQ score of new hires, , from this year is greater than or equal to the mean IQ score of new hires, , from last year. This ...
Sunday, August 3, 2014 at 4:01pm

statistics
DO I NEED TO USE 2-TAILED OR 2-TAILED RESULTS? WHY? A researcher believed that 2 hours per week of intensive exercise would result in significant weight loss after 12 weeks on the schedule. Accordingly, he weighed a group of 50 subjects before and after the 12 week exercise ...
Sunday, August 3, 2014 at 11:32am

statistics
1. A class of 10 students all received a 90 on the final exam. What is the standard deviation?_________
Sunday, August 3, 2014 at 11:20am

statistics
The trends in international mathematic and science study (TIMSS) in 2007 examined eighth grade proficiency in math and science. The mean mathematics scale score for the sample of eighth grade students in the US was 508.5 with a standard error of 2.83. Construct a 95% ...
Saturday, August 2, 2014 at 7:14pm

statistics
Salaries for various positions can vary significantly depending on whether or not the company is in the public or private sector. The U.S. department of labor posted the 2007 mean salary for human resource managers employed by the federal government, as &76, 503. Assume the ...
Saturday, August 2, 2014 at 1:01pm

statistics
Conduct a chi square analysis to determine whether sex and year in college are related. I have tried to submit the data but I can't seem to make the submission work. For my data I used 20 males and 20 females. and for the year in college I have 10 freshman, 10 sophomore, ...
Thursday, July 31, 2014 at 10:53pm

statistics
The following list is a sampling of the costs of various statistics textbooks used at several colleges. Give the upper confidence limit for a 95% confidence interval estimate for the mean cost of all statistics textbooks. 109.95; 92.00; 96.70; 84.85; 92.60; 84.45; 90.95; 77.00...
Thursday, July 31, 2014 at 6:12pm

Statistics
In hypothesis testing, as the a level gets smaller, the level of confidence increases. True or False? And why or why not?
Wednesday, July 30, 2014 at 7:48pm

statistics
In order to subject their cash registers to random audit, suppose we want to select a random sample of three people from this group of cashiers. Bonita, Chandra, Earl, Glenda, Homer, Jamal, Kendra, Maria, Oscar, Reshonda. How do I use a random number table?
Wednesday, July 30, 2014 at 9:00am

statistics
A researcher wishes to estimate the proportion of adults living in rural areas who own a gun. He wishes to achieve a margin of error of 2.8%. What is the minimum sample size needed?
Monday, July 28, 2014 at 1:34am

statistics
The distribution of students’ heights in a class of 100 students is normal, with a mean height of 66 inches and a standard deviation of three. With these parameters, answer the associated question(s). The shortest 10% of the class is equal to or shorter than __________ ...
Sunday, July 27, 2014 at 9:43pm

statistics
A student of the author surveyed her friends and found that among 20 males, 4 smoke and among 30 female friends, 6 smoke. Give two reasons why these results should not be used for a hypothesis test of the claim that the proportions of male smokers and female smokers are equal...
Sunday, July 27, 2014 at 4:21pm

Statistics
How would I solve each system by substitution? I know basically what to do, but I keep getting stuck. Thanks! 1)x=2-y 3x-2y=1 2)2x+3y=-1 x=y-13
Sunday, July 27, 2014 at 2:46pm

Statistics
I need some help on how to write constraints. For example, I don't get how to do these problems and write a constraint for them: 1) A food store owner buys turkeys and hams. The owner plans to purchase at most a total of 50 products. Write a constraint. 2) The food store ...
Sunday, July 27, 2014 at 2:42pm

Statistics
Express the confidence interval (0.033,0.099) in the form of P-E<p<P+E
Sunday, July 27, 2014 at 12:13pm

Statistics
Express the confidence interval (0.033,0.099) in the form of P-E<p<P+E
Sunday, July 27, 2014 at 11:59am

statistics
Scores for men on the verbal portion of the SAT-1 test are normally distributed with a mean of 509 and a standard deviation of 112. If a man is randomly selected, find the probablity tht his score is at least 571
Thursday, July 24, 2014 at 3:55pm

Statistics
Do you drink the recommended amount of water each day? Most Americans don't! On average, Americans drink 5.4 eight-oz servings of water a day. A sample of 36 education professionals was randomly selected and their water consumption for a 24-hour period was monitored; the ...
Wednesday, July 23, 2014 at 8:27am

Statistics
Express the confidence interval using the indicated format. Express the confidence interval -0.129 < p < 0.631 in the form of p ± E.
Monday, July 21, 2014 at 7:14pm

Statistics
Blood samples from 10 persons were sent to each of two labs for cholesterol determination. The measurements are recorded below: Table 1. Serum Cholesterol measurements of Lab 1 and Lab 2 Subject Lab 1 Lab 2 1 296 318 2 268 287 3 244 260 4 272 279 5 240 245 6 244 249 7 282 294 ...
Monday, July 21, 2014 at 4:15pm

Statistics
Hi, Could anyone help me please, because I'm not sure with my answer, Thank you so much for your help and value time. Blood samples from 10 persons were sent to each of two labs for cholesterol determination. The measurements are recorded below: Table 1. Serum Cholesterol ...
Monday, July 21, 2014 at 1:53pm

statistics
In a batch of 8,000 clock radios 5% are defective. A sample of 14 clock radios is randomly selected without replacement from the 8,000 and tested. The entire batch will be rejected if at least one of those tested is defective. What is the probability that the entire batch will...
Monday, July 21, 2014 at 10:53am

statistics
Hi, Could anyone help me please, because I'm not sure with my answer, Thank you so much for your help and value time. Blood samples from 10 persons were sent to each of two labs for cholesterol determination. The measurements are recorded below: Table 1. Serum Cholesterol ...
Monday, July 21, 2014 at 4:35am

statistics
Wages and salaries make up only part of a total compensation. Other parts include paid leave, health insurance, and many others. In 2007, wages and salaries among manufacturers in the United States made up an average of 65.8% of total compensation. To determine if this changed...
Sunday, July 20, 2014 at 10:38pm

Statistics/Probability
A component is rejected if its has a diameter less than 70mm, reworked if the diameter is between 70 and 73.5mm or more than 78.5mm. The diameter of a component is normally distributed with a mean 76mm and standard deviation 2.5mm. In a batch of 400 components, determine the ...
Sunday, July 20, 2014 at 2:49pm

college statistics
The CEO of ABC manufacturing commissioned a study to look at the differences between the current salaries of her employees (n = 474) and their starting salaries. The study collected current and beginning salary data for each of the 474 employees and the researcher conducted a ...
Sunday, July 20, 2014 at 12:47pm

statistics
According to the MIT Airline Data Project, American Airlines controlled 15.5% of the domestic market in 2010. A random sample of 125 domestic passengers that year was selected. Using the normal approximation to the binomial distribution, what is the probability that more than ...
Sunday, July 20, 2014 at 11:05am

statistics
what sampling strategies can be used if the maximum number of students she can include for her survey of 400 and the maximum number of students she can include for her interviews is 20.”
Sunday, July 20, 2014 at 1:03am

statistics
Construct a 95% prediction interval for the number of hours of sleep for an adult who is 45 years old
Saturday, July 19, 2014 at 8:09pm

statistics
Suppose a study is done in which several random samples of people from a population are taken and polled on the number of hours per night they sleep. It is determined that the sample proportion for those who sleep at least 8 hours a night is 36%, and the 95% confidence ...
Saturday, July 19, 2014 at 11:04am

Introduction to statistics
A researcher would like to estimate the population proportion of adults living in a certain town who have at least a high school education. No information is available about its value. How large a sample size is needed to estimate it to within 0.19 with 99% confidence? n= (...
Thursday, July 17, 2014 at 2:46pm

statistics
the daily milk production for a certain type of dairy cow has a mean of 43 pounds per day with a standard diviation of 5 pounds per day. Suppose this daily mild production has a normal distribution. Calculate the probability that a randomly selected cow of this type has a ...
Thursday, July 17, 2014 at 4:34am

Statistics/Probability
5) The product is sold in packets whose masses are normally distributes with mean of 1.42 kg and a standard deviation of 0.025 kg. (1) Find the probability that the mass of a packet, selected at random, lies between 1.37 kg and 1.45 kg
Thursday, July 17, 2014 at 12:48am

Statistics/Probability
A factory produces a particular type of electronic component. The probability of a component being acceptable is 0.95. The components are packed in boxes of 24. (i) Calculate the probability that a box, chosen at random, contains exactly 22 acceptable components. All the boxes...
Thursday, July 17, 2014 at 12:46am

Statistics/Probability
In the production of a particular model of cell phones, it is found that 5% are defective. Cellular phones are selected at random and put into boxes of 10. If a box is selected at random, find the probability that it contains. (i) Exactly three defective phones (ii) Less than ...
Thursday, July 17, 2014 at 12:43am

Statistics/Probability
The standard deviation of the masses of articles in a large population is 4.55 kg. Random samples of size 100 are drawn from the population. Find the probability that a sample mean will differ from the population mean by less than 0.8 kg.
Thursday, July 17, 2014 at 12:26am

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 loaves the shop ...
Thursday, July 17, 2014 at 12:19am

statistics
A committee of three people is to be formed. The three people will be selected from a list of five possible committee members. A simple random sample of three people is taken, without replacement, from the group of five people. Using the letters A, B, C, D, E to represent the ...
Wednesday, July 16, 2014 at 7:34pm

statistics
assuming that you wished to have the highest possible score on an exam relative to ht e other scores, would you rather have a score of 70 on a test with a mean of 60 and a standard deviations of 5.2 or a score of 81 on a test with a mean of 79 and a standard deviation of 7.1?
Monday, July 14, 2014 at 10:09pm

Measurements & statistics in Kinesiology
In a class of 34 students, how many of them will have a z-score above 1.0?
Monday, July 14, 2014 at 9:20pm

statistics
M&M’s The candy company claims that 10% of the M&M’s it produces are green. Suppose the candies are packed at random into small bags containing about 25 M&M’s per bag. A class of elementary students learning about percentages opens several bags, counts the ...
Monday, July 14, 2014 at 3:27pm

statistics
M&M’s The candy company claims that 10% of the M&M’s it produces are green. Suppose the candies are packed at random into small bags containing about 25 M&M’s per bag. A class of elementary students learning about percentages opens several bags, counts the ...
Sunday, July 13, 2014 at 10:36pm

statistics
a brand name has a 50% recognition rate assume the owner of the brand wants to verify that rate by beginning with a small sample of 5 randomly selected consumers the probability that exactly 4 of the 5 consumers recognize the brand name
Sunday, July 13, 2014 at 10:08pm

statistics
A doctor wants to know if her patients are happy with her. She decides to survey a sample of her clients. What method would be best for choosing a random sample that is a fair representation of her patients? A. Assign numbers to each patient and then use a random number ...
Sunday, July 13, 2014 at 7:16pm

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
Sunday, July 13, 2014 at 4:15pm

statistics
the heights of the "basketball fans" at a highly anticipated basketball game.
Saturday, July 12, 2014 at 6:27pm

psy 315
using the 5 steps of hypothesis testing begining salary mean =17,016,09,sd7.870 and current salary mean= 34,419.5,7 sd=17,075 with n=474 of employees test statistics = 33.036,p<.05
Friday, July 11, 2014 at 11:37pm

math 200 statistics
ADHD a researcher studying ADHD among teenagers obtains a simple random sample of 100 teenagers aged 13 to 17 and asks them whether or not they have ever been prescribed medication for ADHD. To say that the distribution of sample proportion (P cap), the sample proportion of ...
Friday, July 11, 2014 at 10:44pm

Statistics
A COMMITTEE OF 5 PEOPLE IS TO BE FORMED FROM 15 PARENTS AND 10 teachers. Find the probability that the committee will consist of at least one parent.
Friday, July 11, 2014 at 12:07am

Statistics/probability
The random variable X has a binomial distribution with the probability of a success being 0.2 and the number of independent trials is 15. The random variable xbar is the mean of a random sample of 100 values of X. Find P(xbar<3.15).
Thursday, July 10, 2014 at 3:00pm

Statistics/Probability
The life span of a calculator has a normal distribution with a mean of 60 months and a standard deviation of 5 months. If a calculator is randomly selected, find the probability that the calculator has a life span of. (1) more than 50 months (2) between 4 years and 6 years.
Thursday, July 10, 2014 at 1:56pm

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