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 8.77 hours of sleep, with a standard deviation of 2.18 hours. Assume that the number of hours of sleep for these visually impaired students is normally distributed.

Answer 1

Explanation:

hours of sleep, with a standard deviation of1.93hours. 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 than6.2hours of sleep?

answer:

(b)What is the probability that a visually impaired student gets between6.8and10.93hours of sleep?

answer:

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

answer:

hours