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 14.79% 7.31% -26.50 8.00 37.25 5.89 23.95 5.17 7.20 5.46 6.59 7.67 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.) Answer is complete but not entirely correct. Large- company stocks T-bills Arithmetic average return 19.30 % 6.58 % a- 1. a- 2. Standard deviation 3.22 X % 1.22 %