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A journal published a study of the lifestyles of visually impaired students. Using diaries, the students...

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

Math   Statistics-And-Probability   
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