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 9.2 hours of sleep, with a standard deviation of 2.24hours. 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? B. What is the probability that a visually impaired student gets between 6.2 and 8.84 hours of sleep? C. Thirty percent of students get less than how many hours of sleep on a typical day?
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 9.2 hours of sleep, with a standard deviation of 2.24hours. Assume that the number of hours of sleep for these visually impaired students is
A. What is the probability that a visually impaired student gets less than 6.4 hours of sleep?
B. What is the probability that a visually impaired student gets between 6.2 and 8.84 hours of sleep?
C. Thirty percent of students get less than how many hours of sleep on a typical day?
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