following table. asset expected return, r standard deviation, s x 10% 5% y 15 8 a. calculate the average return over the 4-year period for each of the three alternatives. b. calculate the standard deviation of returns over the 4-year period for each of the three alternatives. c. use your findings in parts a and b to calculate the coefficient of variation for each of the three alternatives. d. on the basis of your findings, which of the three investment alternatives do you think performed better over this period?