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A leasing firm operates on the assumption that the annual number of miles driven in its...

A leasing firm operates on the assumption that the annual number of miles driven in its leased cars is normally distributed with mean 13,500 and standard deviation 4000 miles. To see whether this assumption is valid, a random sample of 36 one-year-old cars has been checked. What conclusion can you draw if the average mileage on these 36 cars is 15,233?
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TOPIC:One sample z-test for population mean.

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