An owner of a fleet of taxis wants to estimate the mean gas mileage, in miles per
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An owner of a fleet of taxis wants to estimate the mean gas mileage, in miles per gallon, of the cars in the fleet. A random sample of 40 cars is followed for one month, and the sample mean gas mileage is 23.2 with a standard deviation of 5.8.
Construct a 90% confidence interval for the mean gas mileage in the fleet.
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