Consider the following table for a period of six years. a. Calculate the arithmetic average returns for large-company stociks and T-bilis 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. b. 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.9., 32.16. c. Calculate the observed risk premium in each year for the large-company stocks versus the T-bills. What was the arithmetic average risk premlum over this period? Note: A negotive 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.9., 32.16. d. What was the standard deviation of the risk premium over this period? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16