Year Stock Market Return (%) Return (%) 2016 2017 2018 2019 2020 32.70 12.10 -2.80 13.80 22.50 0.08 0.08 0.08 0.26 0.28 Required: a. What was the risk premium on common stock in each year? b. What was the average risk premium? c. What was the standard deviation of the risk premium? (Ignore that the estimation is from a sample a Complete this question by entering your answers in the tabs below. Required A Required B Required C Standard deviation X Answer is not complete. What was the standard deviation of the risk premium? (Ignore that the estimation is from a sample of data.) Note: Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places. % The EN EXTE 129 601501