The lifetime of a certain brand of battery is known to have a standard deviation of 16 hours. Suppose that a random sample of 90 such batteries has a Main lifetime of 32.8 hours. Based on this sample, find a 95% confidence interval for the true mean lifetime of all batteries of this brand. Then give us lower limit and upper limit. Carrier intermediate computations at least three decimal places. Round your answer to one decimal place.

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