Stocks Y and Z have the following historical returns: Returns Z (30%) 1% Year 2015 2016 2017 2018 2019 Y (9%) 3% 11% 20% 35% 21% 26% 42% . Calculate the expected returns for Stocks Y and Z. . Calculate the standard deviations of expected returns for Stocks Y and Z. . Calculate the coefficients of variation for Stocks Y and Z. . Which of these two stocks is the preferred investment, based upon both risk and return? Explain why you made the choice you did, by interpreting your data