5.28 - Total Sleep Time of College Students In example, 5.4, the total sleep time per night among college students was approximately normally distributed with a mean = 6.78 hours and standard deviation = 1.24 hours. You plan to take an SRS of size n=120 and compute the average total sleep time. a. What is the standard deviation for the average time?   b. Use the 95 part of the 68-95-99.7 rule to describe the variability of this sample mean.   c. What is the probability that your average will be below 6.9 hours?

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