An automotive repair shop has determined that the average service time on an automobile is 130 minutes with a standard deviation of 26 minutes. A random sample of 40 automotive services is selected
a. Compute the standard error of the mean.
b. What is the probability that the sample of 40 automotive services will have a mean service time greater than 136 minutes?
c. Assume the population consists of 400 automotive services. Determine the standard error of the mean.
a. 4.11
b. 0.0721
c. 3.9
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