Question

A normal population has a mean of 56 and a standard deviation of 11. You select a random sample of 9.

 

Compute the probability that the sample mean is: (Round your z values to 2 decimal places and final answers to 4 decimal places):

a) Greater than 58.

 

 

b) Less than 55.

 

 

c) Between 55 and 58.

 

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