MATLAB: An Introduction with Applications
MATLAB: An Introduction with Applications
6th Edition
ISBN: 9781119256830
Author: Amos Gilat
Publisher: John Wiley & Sons Inc
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Question

 Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students averaged 8.28.2 hours of sleep, with a standard deviation of 2.22.2 hours. Assume that the number of hours of sleep for these visually impaired students is normally distributed.

(a)  What is the probability that a visually impaired student gets less than 6.56.5 hours of sleep?

answer: 

(b)  What is the probability that a visually impaired student gets between 6.96.9 and 10.6810.68 hours of sleep?

answer: 

(c)  Twenty percent of students get less than how many hours of sleep on a typical day?

answer:  hours

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