Assume these are the stock market and Treasury bill returns for a 5-year period Stock Market T-Bill Return Year 2011 2012 2013 2014 2015 Return (%) 0.98 16.06 33.86 12.71 0.67 0.03 0.05 0.07 0.85 a. What was the risk premlum on common stock In each year? (Do not round Intermedlete calculatlo answers as a percent rounded to 2 declmal places.) Answer is complete and correct. Year 2011 2012 2013 2014 2015 Risk Premium 0.95 % 16.01 % 32.99 | % 12.66?196 0.46 % b. What was the average risk premium? (Do not round Intermedlete calculetlons. Enter your answe rounded to 2 declmal places.) Answer is complete and correct. Average risk 12.61?96 um c. What was the standard devlation of the risk premium? (lgnore that the estimation is from a sample not round Intermedlate calculetions. Enter your answer as a percent rounded to 2 declmal pleces Standard deviation