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 8.89?hours and a standard deviation of 2.11?hours. Assume that the distribution of the number of hours of sleep for this group of students is approximately normal. Complete parts a and part b.
a. Find the probability that a visually impaired student obtains less than 6 hours of sleep on a typical day
.P(x < 6) = _ (Round to four decimal places as needed.)
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