Assume these are the stock market and Treasury bill retuins for a 5-year period: Required: a. What was the risk premium on common stock in each year? b. What was the average risk premlum? c. What was the standard deviation of the risk premium? (lgnore that the estimation is from a sample of data) Complete this question by entering your answers in the tabs below. Whot was the risk premlum on common stock in each year? Notes Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal placen. Negative valiaes should be entered with a negative sign