Consider the following table for a period of six years. Year Returns Large-Company Stocks U.S. Treasury Bills 1973 14.69% 6.93% 1974 26.47 8.00 1975 37.23 5.80 1976 23.93 5.08 1977 7.16 5.12 1978 6.57 7.18 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. Calculate the standard deviation of the returns for large-company stocks and