=+to estimate average passenger plus carry-on weights. They found an average summer weight of 183 lb and

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=+to estimate average passenger plus carry-on weights.

They found an average summer weight of 183 lb and a winter average of 190 lb. Suppose that each of these estimates was based on a random sample of 100 passengers and that the sample standard deviations were 20 lb for the summer weights and 23 lb for the winter weights.

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