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 8.79 hours of sleep, with a standard deviation of 1.12 hours
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 8.79 hours of sleep, with a standard deviation of 1.12 hours. Assume that the number of hours of sleep for these visually impaired students is
(A) What is the
(B) What is the probability that a visually impaired student gets between 7 and 10.74 hours of sleep?
(C) Fourty percent of students get less than how many hours of sleep on a typical day?
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