5.16 Sleep duration of college students. In Example 5.4, the daily sleep duration among college students...

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5.16 Sleep duration of college students. In Example 5.4, the daily sleep duration among college students was approximately Normally distributed with mean = 7.13 hours and standard deviation = 1.67 hours. You plan to take an SRS of size n = 60 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? 5.16 Sleep duration of college students. In Example 5.4, the daily sleep duration among college students was approximately Normally distributed with mean = 7.13 hours and standard deviation = 1.67 hours. You plan to take an SRS of size n = 60 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?