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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 8.46 hours of sleep, with a standard deviation of 2.44 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 6.9 hours of sleep?

b) What is the probability that a visually impaired student gets between 6.7 and 10.65 hours of sleep?

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

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Statistics and Probability, Statistics

Category:- Statistics and Probability
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