S Consider the following rates of return: Large-Company a. Year Stocks US Treasury Bills 123456 3.99% 6.65% 14.50 4.46 19.39 4.33 7.34 5.44 6.45 -14.29 -31.78 37.10 Calculate the arithmetic average returns for large-company stocks and T-bills over this period. (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Large-company stocks T-bills % % b. Calculate the standard deviation of the returns for large-company stocks and T-bills over this period. (Do not round intermediate calculations and enter your answers