An electrical firm manufactures light bulbs that have a length of life that is approximately normally distributed with a standard deviation of 50 hours. If a sample of 45 bulbs has an average life of 730 hours, find a 96% confidence interval for the population mean of all bulbs produced by this firm. Click here to view page 1 of the standard normal distribution table Click here to view page 2 of the standard normal distribution table Click here to view page 1 of the table of critical values of the t-distribution. Click here to view page 2 of the table of critical values of the t-distribution. The confidence interval is |