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Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted....

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 8.38 hours of sleep, with a standard deviation of 2.76 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 6.6 hours of sleep? (b) What is the probability that a visually impaired student gets between 6 and 8.56 hours of sleep? (c) Fourty percent of students get less than how many hours of sleep on a typical day?

Math   Statistics-And-Probability   
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hii... although I am trying to provide the detailed answer but if you have any doubt please ask by comment. please like the answer. thanks..

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