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The operation manager at a tire manufacturing company believes that the mean mileage of a tire is 20,138 miles. With a variance of 10,304,100. What

The operation manager at a tire manufacturing company believes that the mean mileage of a tire is 20,138 miles. With a variance of 10,304,100. What is the probability that the sample mean would be less than 19,448 miles in a sample of 171 tires if the manager is correct

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