Number of Jobs A sociologist found that in a sample of 50 retired men, the average number of jobs they had during their lifetimes was 6.8. The population standard deviation is 2.2. Part 1 of 4 (a) Find the best point estimate of the mean. The best point estimate of the mean is 6.8 Part: 1 / 4 Part 2 of 4 (b) Find the 99% confidence interval of the mean number of jobs. Round intermediate and final answers to one decimal place.