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Question 21 (2 points) A car company says that the mean gas mileage for its luxury sedan is 21 mpg. You believe the mean gas

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Question 21 (2 points) A car company says that the mean gas mileage for its luxury sedan is 21 mpg. You believe the mean gas mileage is lower than this and find that a random sample of 5 cars has a mean gas mileage of 19 mpg and a sample standard deviation of 4 mpg. Assume the gas mileage of all of the company's luxury sedans is normally distributed. At

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