Question: This is from a probability practice problem set and I don't know how t go about it (1 point) Using diaries for many weeks, a

This is from a probability practice problem set and I don't know how t go about it

(1 point) 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 9.29 hours of sleep, with a standard deviation of 1.22 hours. Assume that the number of hours of sleep for these visually impaired students is normally distributed. (a) What is the probability that a visually impaired student gets less than 6.4 hours of sleep? answer: (b) What is the probability that a visually impaired student gets between 6.3 and 8.64 hours of sleep?

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