Suppose we have the following returns for large-company stocks and Treasury bills over a six year period Year 2 4 6 Large Company 3.66 14.44 19.03 14.65 -32.14 37.27 US Treasury Bill 4.66 2.33 4.12 5.88 4.90 6.33 a. Calculate the arithmetic average returns for large-company stocks and T-bills over this period. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Average returns 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. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Standard deviation Large company stocks T-bills