2. The average comic book has 55 pages and a standard deviation of 7 pages. Assume it has a normallydistributed.a) If a single comic book is selected, find the probability that the number of pages will be greaterthan 73.b) If 25 comic books are selected, find the probability that the that the number of pages will begreater than 73.

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Answered: 2. The average comic book has 55 pages…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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The results of a survey indicates that the time a shopper spends in a supermarket is approximately normally distributed with an average of 45 minutes and a standard deviation of 12 minutes. A shopper enters the store. a) Sketch the distribution. b) Find the probability that the shopper will be in the store for between 9 and 57 minutes. c) Find the probability that the shopper will be in the store for more than 33 minutes. d) 200 shoppers enter the store in the early evening, approximately how many shoppers would be expected to finish shopping in less than one hour and nine minutes?
There are two car battery producers, such as A and B. The mean lifetimes of batteries are 1424 and 1624days from the producers of A and B, respectively. The standard deviations of the batteries from both manufacturers are 200 and 100 days for A and B, respectively. Random samples of 120 batteries from each company are selected for the test.a) Please find the probability for the Brand A batteries that the average lifetime is at most 960 days.b) Find the probability for the Brand A batteries that the average lifetime is 150 days more than the batteries from Brand B.
The average weight of newborns is 2150 grams. The standard deviation is 480 grams. Assume the variable is normally distributed. If a newborn is selected at random, find the probability that a) The newborn will weigh less than 2846 grams. b) The newborn will weigh between 3118 and 4038 grams. c) What is the 60th percentile of the weights? d) If a sample of 40 newborns were selected, find the probability that the sample mean is greater than 3330 grams.
according to a recent poll, 95% of millenials (people born between 1981 and 1995) have a profile on a social networking site. Let X = the number of millenials you ask until you find a person without a profile on a social networking site. A) Find the mean and standard deviation of X. B)What is the probability that you must ask ten people to find one person without a social networking site? C) What is the probability that you must ask 20 people to find one person without a social networking site? D) What is the probability that you must ask at most five people?
The mean starting salary for nurses is $67,694 nationally ("Staff nurse -," 2013).The standard deviation is approximately $10,333. The starting salary is notnormally distributed but it is mound shaped. A sample of 42 starting salaries fornurses is taken.a.) State the random variable.b.) What is the mean of the sample mean?c.) What is the standard deviation of the sample mean?d.) What is the sampling distribution of the sample mean? Why?e.) Find the probability that the sample mean is more than $75,000.f.) Find the probability that the sample mean is less than $60,000.g.) If you did find a sample mean of more than $75,000 would you find thatunusual? What could you conclude?
The heights of palm trees along a beach are normally distributed with a mean of 4.55m and a standard deviation of 0.37m. a) Find the probability that a randomly chosen tree has a height greater than 4.55m. b) Find the probability that a randomly chosen tree will be within 2 standard deviations of the mea Give your answer as an integer percentage. c) Use your graphic display calculator to calculate the probability that a randomly chosen tree will have a height greater than 4m. d) The probability that a particular tree is less than x meters tall is 0.75. Find the value
Only c and d part please
Last year, eight employees of an electronics company retired. Their ages of retirement are listed below, 65, 63, 59, 64, 58, 62, 61, 90 Find the standard deviation of the retirement ages a) 10.3 years b) 32 years c) 3.6 years d) 4.5 years e) none of the above
A random variable follows the normal probability distribution with a mean of 100 and a standard deviation of 10. determine the probability for a random selected value from this population. a) what is the probability that the value is less than 90? b) what is the probability that the value is less than 95? c) what is the probability that the value is more than 130? d) what is the probability that the value is more than 85? Please help me! Thank You!
Assume that different groups of couples use a particular method of gender selection and each couple gives birth to one baby. This method is designed to increase the likelihood that each baby will be a girl, but assume that the method has no effect, so the probability of a girl is 0.50. Assume that the groups consist of 32 couples. A) Find the mean and the standard deviation for the numbers of girls in groups of 32 births.
2) Battery lifetime is normally distributed for large samples. The mean lifetime is 500 days and the standard deviation is 61 days. a) Find the distribution by filling in the blanks: X~N( b) Find the probability of batteries that have lifetimes longer than 561 days? Round to 4 decimals. c) Find the probability of batteries that have lifetimes at most 497 days? Round to 4 decimals.
8. The average cholesterol content of a certain brand of eggs is 215 milligrams, and the standard deviation is 15 milligrams. Assume the variable is normally distributed. a) If a single egg is selected, find the probability that the cholesterol content will be greater than 220 milligrams. b) Ifa sample of 25 eggs is selected, find the probability that the mean of the sample will be larger than 220 milligrams.

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