fetime of a certain brand of battery is known to have a standard deviation of 23 hours. Suppose that a random sample of 60 such batteries has a mean he of 41.1 hours. Based on this sample, find a 95% confidence interval for the true mean lifetime of all batteries of this brand. Then give its lower limit and limit. your intermediate computations to at least three decimal places. Round your answers to one decimal place. (If necessary, consult a list of formulas.) ower limit: pper limit: I

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