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From a random sample of 40 days in a recent year, U.S. gasoline prices had a mean of $2.54 with a known population standard deviation

From a random sample of 40 days in a recent year, U.S. gasoline prices had a mean of $2.54 with a known population standard deviation of $0.28. Find the 95% confidence interval for the average gas price per gallon during those 40 days.

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