#28 Profits: Banks The following data provides the annual profits per employee (in units of one thousand dollars pe employee) for representative companies in financial services> 42.9 43.8 48.2 60.6 54.9 36.9 27.0 47.1 33.8 28.1 28.5 28.8 29.3 31,5 31.7 31.1 38.0 43.8 36.9 25.5 23.2 29.8 22.3 55.1 52.9 54.9 42.5 29.1 36,5 36.1 26.9 27.8 32.0 31.7 32.9 23.1 26.5 26.7 33.0 33.6 54.9 a. Assume that this data represents the entire sector of (successful) financial services corporations. Find the 75% confidence interval for u, the average annual profit per employee for all successful banks. b. Repeat (a) for a 90% confidence level.