Consider the following table for a period of six years: Calculate the observed risk premlum in each year for the large-company stocks versus the T-bills. b-1. What was the arithmetic average risk premium over this period? Note: 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? Note: Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.9. 32.16