**23. TV Sets:**A Nielsen Company report states that the mean number of TV sets in a U.S. household is 2.24. Assume the standard deviation is 1.2. A sample of 85 households is drawn.a. What is the probability that the sample mean number of TV sets is greater than 2?b. What is the probability that the sample mean number of TV sets is between 2.5 and 3?c. Find the 30th percentile of the sample mean.d. Would it be unusual for the sample mean to be less than 2?e. Can you tell whether it would be unusual for an individual household to have fewer than 2 TV sets? Explain.

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Answered: 23. TV sets: A Nielsen Company report…

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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a. The standard deviation of 25 scores is 10, the mean is 29, the median is 24 and the mode is 23. What is the coefficient of skewness? Describe the distribution. b. The following are scores of 8 students in Algebra: 89, 88, 77, 84, 83, 92, 91 and 96. Find the coefficient of skewness.
7. Take a look at the following data set: 4 6 8 10 12, What is the sample standard deviation?
A primary measure of dispersion for sample data is the sample standard deviation, s. Choose the best option to explain what the meaning of the sample standard deviation is, in general. A. The distance between one observation and the mean. B. The average distance of an observation from the middle of the distribution. C. The average distance between observations in the sample. D. The distance between the third and first quartiles.
Find the mean and standard deviation of the following sample: 7.2 7.4 7.5 7.2 7.1 6.9 7.7 7.4
5. The NBA commissioner wishes to know how many hours per day NBA players watch TV. He sampled the following players Player Kobe hours 4. James 2 Shaq Rose 9. 1. .2 n-1 Find the mean and standard deviation for this sample
36. Electric bills: According to the U.S. Energy Information Administration, the mean monthly household electric bill in the United States in a recent year was $110.14. Assume the amounts are normally distributed with standard deviation $20.00. a. What proportion of bills are greater than $130? b. What proportion of bills are between $85 and $140? c. What is the probability that a randomly selected household had a monthly bill less than $120?
4. The average salary for first-year teachers is $27,989. Assume the distribution is approximately normal with standard deviation $3250. a. What is the probability that a randomly selected first-year teacher makes between $20,000 and $30,000 each year? b. What is the probability that a randomly selected first-year teacher has a salary less than $20,000?
1. According to one study, the average hours of sleep on a weeknight for men was 6.9 hours with a standard deviation of 1.5 hours. a. Find the proportion of men who sleep for more than 8 hours per night. b. Find the proportion of men who sleep for less than 6 hours per night. c. Find the proportion of men who sleep between 6-8 hours per night. d. Find the number of hours that represents the 90th percentile.
1. The EPA fuel economy estimates for automobile models tested recently predicted a mean of 24.8 mpg and a standard deviation of 6.2 mpg for highway driving. a. About what percent of cars get less than 31 mpg? b. What percent of cars get more than 20 mpg? c. What percent of cars get between 22 and 30 mpg? d. What gas mileage represents the 75th percentile? e. What gas mileages separate the bottom 3% and top 3% of cars? X
McPhilly is conducting a study on the amount of money a customer spends on each visit to the restaurant. The company looks at the receipts from 20 McPhilly restaurants. The company found that the mean amount spent is $11 with a $3 standard deviation. a. What type of sampling method was used? b. What is the probability that a customer spend greater than $8 each visit? c. What is the probability that a customer spends less than $13 each visit? d. The customers were asked to respond to the following survey question, determine if the question is biased. Explain why or why not? "What menu item gives you the best value?
In a distribution with a mean of 80 and a standard deviation of 8, what percentage of number would be: a. Less than 64 or greater than 96 b. Less than 60 or greater than 100 c. Less than 52 or greater than 108

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