Year 1 2 3 4 5 6 Returns Large-Company Stocks -15.29% -26.65 37.35 24.05 -7.40 6.69 U.S. Treasury Bills a-1. Arithmetic average return a-2. Standard deviation 7.41% 8.05 5.99 5.67 5.51 7.82 a-1. Calculate the arithmetic average returns for large-company stocks and T-bills over this time period. Note: Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16. a-2. Calculate the standard deviation of the returns for large-company stocks and T-bills over this time period. Note: Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16. Large-company stocks 3.13 % 24.32% T-bills 6.74 % % Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. b-1. What was the arithmetic average risk premium over this period? Note: A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to 2 dec