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Assume that the average gas mileage of all automobile is 21.6 miles per gallon. For a random sample of 40 sport utility vehicles, the mean

Assume that the average gas mileage of all automobile is 21.6 miles per gallon. For a random sample of 40 sport utility vehicles, the mean gas mileage is 20.7 miles per gallon with a standard deviation of 3.8 miles per gallon. Test the claim that the mean mileage of all SUVs is less than 21.6 miles per gallon. Find the z score

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