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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 8.28 hours of sleep, with a standard deviation of 1.9 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? answer:

(b) What is the probability that a visually impaired student gets between 6.2 and 8.12 hours of sleep? answer:

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