Question

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 9.83 hours of sleep, with a standard deviation of 2.02 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 9.09 hours of sleep?

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

(I have many questions similar to this, please be as thorough as possible, especially on b and c)

Answer 1

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