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After-Class 4 A - Saved Help Save & Exit Submit Check my work 4 Year 2.08 points -NM Returns Large- U.S. Company Stocks Treasury Bills - 15.79% 7.51% -26.80 8.10 37.45 6.09 24.15 6.17 7.60 5.56 6.79 7.97 1978 eBook Hint Print References a-1. Calculate the arithmetic average returns for large-company stocks and T-bills over this time period. (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. (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 % % a-1. Arithmetic average return a-2. Standard deviation % % 2.08 points eBook Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. Hint Print References b-1. What was the arithmetic average risk premium over this period? (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 decimal places, e.g., 32.16.) b-2. What was the standard deviation of the risk premium over this period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b-1. Average risk premium b-2. Risk premium standard deviation % : %