please answer all parts and for part 4 the "(choose one)" answer options are less&more thank you! :)

Number of Jobs A sociologist found that in a sample of 55 retired men, the average number of jobs they had during their lifetimes was 7.2. The population standard deviation is 2.3 . Part: 0 / 4 Part 1 of 4 (a) Find the best point estimate of the mean. The best point estimate of the mean is . X 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 X Part: 2 / 4 Part 3 of 4 (c) Find the 90% confidence interval of the mean number of jobs. Round intermediate and final answers to one decimal place. O