Assume these are the stock market and Treasury bill returns for a 5-year period: Stock Harket T-Bi1l 2011 2012 2013 2014 2015 0.98 16.06 33.06 12.71 0.67 0.03 0.05 0.07 0.05 0.21 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.) Answer is complete and Risk 201 201 201 201 201 0.9 32 12. 0 b. what was the average risk premium? (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Answer is complete and Average risk 12.6 C. What was the standard deviation of the risk premium? (ignore that the est mation is from a sample of data.) (Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Answer is complete but not 36.500