Question

A journal published a study of the lifestyles of visually impaired students. Using diaries, the students kept track of several variables, including number of hours of sleep obtained in a typical day. These visually impaired students had a mean of

8.85 hours and a standard deviation of 2.13

hours. Assume that the distribution of the number of hours of sleep for this group of students is approximately normal. Complete parts a through c.

**a.** Find

P(x> 12)=0.0694

(Round to four decimal places as needed.)

**b.** Find

P(8<x< 10)=0.3608

(Round to four decimal places as needed.)

**c.** Find the value a for which

P(x< a)=0.3

Answer #1

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