The miles per gallon attained by purchasers of a line of pickup trucks manufactured in Detroit are

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The miles per gallon attained by purchasers of a line of pickup trucks manufactured in Detroit are outcomes of a random variable with a mean of 17 miles per gallon and a standard deviation of .25 miles per gallon. How probable is the event that a purchaser attains between 16 and 18 miles per gallon with this line of truck?

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