Problem 11-6 Risk Premiums (L01) Assume these are the stock market and Treasury bill returns for a 5-year period: 2011 2012 2013 Stock Market T-nin Return 2:58 0.03 16.06 0.05 0.07 12.1 0.21 2015 a. What was the risk premium on common stock in each year? (Do not round Intermediate calculations. Enter your answers as a percent rounded to 2 decimal places Year Risk Premium 2012 2013 2014 2015 b. What was the average riak premium (Do not round Intermediate colectations. Enter your answer as a percent rounded to 2 decimal places Average risk premium c. What was the standard deviation of the risk premium dignote that the estimation is from a sample of data (Do not round Intermediate calculations. Enter your answer as a percent rounded to 2 decimal places) Standard deviation