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(1 point) Using diaries for many weeks, a study on the lifestyles of visually impaired students...

(1 point) 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 8.4 hours of sleep, with a standard deviation of 1.91 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 6.86.8 hours of sleep?

(b)  What is the probability that a visually impaired student gets between 6.66.6 and 10.7110.71 hours of sleep?

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

Math   Statistics-And-Probability   
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