Consider the following rates of return: Large- Company Stocks 3.96% US Year Treasury Bill 4.50% 1 14.12 4.88 19.01 -14.67 -32.16 3.80 6.96 4 5 4.88 6 37.26 6.14 a. 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 as a percent rounded to 2 decimal places, e.g., 32.16.) Large company stocks % T-bills % N m LO O