An electrical firm manufactures light bulbs that have a length life with normal distribution, and a standard deviation of o= 10 hours. A sample of size n = 100 is obtained, and its sample mean is calculated to be = 400 hours. Find the 99% confidence interval for the average length life fl. Find the upper 99% bound for the average length life μ. Find the lower 99% bound for the average length life μl.

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