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An electrical firm manufactures light bulbs that have a length of life that is normally distributed with a standard deviation of 40 hours. If

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An electrical firm manufactures light bulbs that have a length of life that is normally distributed with a standard deviation of 40 hours. If a sample of 30 bulbs has an average life of 780 hours, find the maximum error of estimate for the population mean (u) of all bulbs produced by this firm, for a level of confidence of 96%.

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