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 I = 410 hours. Find the 99% confidence interval for the average length life p. Find the upper 99% bound for the average length life p. Find the lower 99% bound for the average length life u. Give your answer as intervals. Use - and + if needed. Submit