The total sleep time per night among college students was apprximately normally distrubuted with mean. 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 of 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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The total sleep time per night among college students was apprximately normally distrubuted with mean. 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 of 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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