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One gallon of gas is put into each of 30 test cars. The resulting gas-mileage values of the sample are computed with mean of 28.5

One gallon of gas is put into each of 30 test cars. The resulting gas-mileage values of the sample are computed with mean of 28.5 gallons per mile, and standard deviation of 1.2 miles per gallon. What is the 95% confidence interval estimate of the mean mileage?

(28.1, 28.9)
(27.3, 29.7)
(28.46, 28.54)
(27.36, 29.64)
(28.42, 28.58)

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