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 9.2 hours of sleep, with a standard deviation of 2.24hours. 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 6.4 hours of sleep? B. What is the probability that a visually impaired student gets between 6.2 and 8.84 hours of sleep? C. Thirty percent of students get less than how many hours of sleep on a typical day?

A First Course in Probability (10th Edition)
10th Edition
ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...
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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 9.2 hours of sleep, with a standard deviation of 2.24hours. 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 6.4 hours of sleep?

B. What is the probability that a visually impaired student gets between 6.2 and 8.84 hours of sleep?

C. Thirty percent of students get less than how many hours of sleep on a typical day?

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