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Find a confidence interval for the true mean

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The lifetime of a certain brand of battery is known to have a standard deviation of 19.8 hours. Suppose that a random sample of 80 such batteries has a mean lifetime of 35.8 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 upper limit

Reference no: EM132850448

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