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

An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 40 hours. If a sample of 30 bulbs has an average life of 780 hours.

(a) Find a 96% confidence interval for the population mean of all bulbs produced by this firm.

(b) Please interpret the CI you obtained in part (a).

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