Consider the following table for a period of six years: Year 1 2. 3 4 5 6 Returns Large- U.S. Company Stocks Treasury Bills - 16.39% 7.63% -26.98 8.16 37.57 6.21 24.27 6.77 7.84 5.62 6.91 8.15 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 sel % % % % a-1. Arithmetic average return a-2. Standard deviation 1% % % 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? (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 %