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Mathematics, 25.04.2020 05:01 cocoapop
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 probability that the mean service time is between 1 and 2 hours, i. e., 60 and 120 minutes
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