Suppose we have the following returns for large-company stocks and Treasury bills over a six-year period: Year Large-Company US Treasury Bill 1 3.68 4.72 2 14.15 3.57 3 19.19 4.16 4 14.49 5.90 5 31.98 5.24 6 37.43 6.18 Calculate the arithmetic average returns for large-company stocks and T-bills over this time period. Calculate the standard deviation of the returns for large-company stocks and T-bills over this time period Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the arithmetic average risk premium over this period? Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the standard deviation of the risk premium over this period