Suppose we have the following returns for large-company stocks and Treasury bills over a six year period: 3.98 14.17 19.31 -14.37 -31.86 37.02 6.62 4.44 4.31 7.33 5.36 6.23 5 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. not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) (Do Standard deviation Large company stocks T-bills c-1 Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the average risk premium over this period? (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g, 32.16.) Average risk premium c-2 Calculate the observed risk premium in each year for the large-company stocks s versus the Tbills. What intermediate was the standard deviation of the risk premium over this period? (Do not round calculations. Enter your answer as a percent rounded to 2 decimal places, e.g. 32.16.) Standard deviation