2 S Book Hint erences Problem 10-7 Calculating Returns and Variability Year 12345 Returns X 17% 20 -7 11 10 Y Average returns Variances Standard deviations 226526 20% 32 - 18 15 Using the returns shown above, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. (Do not round intermediate calculations. Enter your average return and standard deviation answers as a percent rounded to 2 decimal places, e.g., 32.16. Enter your variance answers rounded to 5 decimal places, e.g., .16161.) X 10.20% % Y 14.20 % do %