The distribution of the number of hours people spend at work per day is unimodal and symmetric with a mean of 8 hours and a standard deviation of 0.7 hours. (a) If Saba’s z-score for his work hours was −1.3 , how many hours did he work? (b) Would 6.5 hours spent at work per day be considered unusual? Explain how you know.

The distribution of the number of hours people spend at work per day is unimodal and symmetric with a mean of 8 hours and a standard deviation of 0.7 hours. (a) If Saba’s z-score for his work hours was −1.3 , how many hours did he work? (b) Would 6.5 hours spent at work per day be considered unusual? Explain how you know.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Suppose that the scores on a reading ability test are normally distributed with a mean of 60 and a standard deviation of 10. What proportion of individuals score less than 71 points on this test? Round your answer to at least four decimal places.
Suppose that the scores on a reading ability test are normally distributed with a mean of 70 and a standard deviation of 9. What proportion of individuals score at most 85 points on this test? Round your answer to at least four decimal places.
Suppose that the heights of adult men in the United States are normally distributed with a mean of 69 inches and a standard deviation of 3 inches. What proportion of adult men in the United States is at least 6 feet tall? (Hint 6 feet=72 inches.) Round answer to at least 4 decimal places.
One year the ACT had a mean score of 22.7 and a standard deviation of 4.1. minutes. (a)Calculate the z-score of an ACT score of 25. Interpret it using a complete sentence. B. What ACT score is 1.5 standard deviations above the mean? What can you say about this consumption
Suppose the scores on your last Algebra 2 test were normally distributed, with a mean of 81% and a standard deviation of 3%. To show you how you compared to your classmates, the teacher did not record your grades as per- centages, instead, she wrote them as z-scores. You look at your paper and see "2.66" written at the top. What was your score as a percentage? Explain how you determined your answer.
On a measure of anxiety, the mean is 83 and the standard deviation is 12.What are the Z scores for each of the following raw scores? (a) 131 and (b) 66. (a) Z131=nothing
Suppose that the scores on a reading ability test are normally distributed with a mean of 65 and a standard deviation of 9. what proportion of individuals score at most 52 points on this test? Round your answer to at least four decimal places. ?
A successful basketball player has a height of 6 feet 11 inches, or 211 cm. Based on statistics from a data set, his height converts to the z score of 5.17. How many standard deviations is his height above the mean?
The mean score for first exam in your first organic chemistry class (section A) was 60, with a standard deviation of 5. Your score on the exam was 70. A. How many standard deviations above the mean is your score?
2. Alfred scored 82 in a quiz in English for which the average Score of the class was 75 with a standard deviation of 10. He also took a quiz in Statistics and scored 70 for which the average score of the class was 55, and the standard deviation was 14. Relative to other students in the class, did Alfred do better in English or Statistics?
On an intelligence test, the mean number of raw items correct is 236 and the standard deviation is 39. What are the raw (actual) scores on the test for people with IQs of (a) 119, (b) 81, and (c)100? To do this problem, first figure the Z score for the particular IQ score; then use that Z score to find the raw score. Note that IQ scores have a mean of 100 and a standard deviation of 15. (a) What is the raw (actual) score on the test for people with an IQ of 119?
Suppose that the scores on a reading ability test are normally distributed with a mean of 60 and a standard deviation of 8. What proportion of individuals score less than 47 points on this test? Round your answer to at least four decimal places.