SOLUTION: When a production machine is properly calibrated, it requires an average of 25 seconds per unit produced, with a standard deviation of 3 seconds. For a simple random sample of n=36

Question 1023350: When a production machine is properly calibrated, it requires an average of 25 seconds per unit produced, with a standard deviation of 3 seconds. For a simple random sample of n=36 units, the sample mean is found to be 26.2 seconds per unit. What z-score corresponds to the sample mean of 26.2 seconds?
Select one:
a. 3.2
b. 1.9
c. 2.4
d. 2.9
Answer by robertb(5830) (Show Source): You can put this solution on YOUR website!
c. 2.4

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