A journal published a study of the lifestyles of visually impaired students. Usingdiaries, the students kept track of severalvariables, including number of hours of sleep obtained in a typical day. These visually impaired students had a mean of 8.32

8.32 hours and a standard deviation of 2.11

2.11 hours. Assume that the distribution of the number of hours of sleep for this group of students is approximately normal.

Find P(x >12).