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An automotive repair shop has determined that the average service time on an automobile is 130 minutes with a standard deviation of 26 minutes.

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. Show the sampling distribution of the sample mean. b. What is the probability that the sample of 40 automotive services will have a mean service time greater than 136 minutes?

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