Problem 8-05 Two investments generated the following annual returns: 20x0 20x1 20x2 20x3 20x4 Investment 15 % 19 20 19 10 Investment Y 18 % 22 15 11 22 a. What is the average annual return on each investment? Round your answers to one decimal place, The average annual rate of return on X: % The average annual rate of return on Y: % b. What is the standard deviation of the return on investments X and Y? Round your answers to two decimal places. Standard deviation of X: Standard deviation of Y: C. Based on the standard deviation, which investment was riskier? -Select- was riskier