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Test: Math 137 Midterm Exam F2021 Question 18 This Test: 110 pts possible Submit Test 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 9.38 hours and a standard deviation of 2.12 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). P(x> 12) = (Round to four decimal places as needed.) b. Find P(8