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An airline inspector wishes to estimate the mean weight of 5000 pieces of luggage. A random sample of 90 pieces of luggage has a mean

An airline inspector wishes to estimate the mean weight of 5000 pieces of luggage. A random sample of 90 pieces of luggage has a mean weight of 65 pounds and a standard deviation of 15 pounds. Which one of the following best approximates a 90% confidence interval for ?

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