The 100 appointments showed an average preparation time of


The service department of a luxury car dealership conducted research on the amount of time its service technicians spend on each car being serviced. It collected a systematic random sample of 100 such service appointments. The 100 appointments showed an average preparation time of 90 minutes with a standard deviation of 140 minutes. What is the standard error of the mean?

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Basic Statistics: The 100 appointments showed an average preparation time of
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