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An electrical firm manufactures flashlight that have length of life that is normally distributed, with a standard deviation of 35 hours. If a random sample

An electrical firm manufactures flashlight that have length of life that is normally distributed, with a standard deviation of 35 hours. If a random sample of 150 flashlights has a mean life of 480 hours, construct a 99% confidence interval for the mean of the flashlights produced by the firm

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