Problem 10-7 Calculating Returns and Variability Returns YearX 17% 20 7 20 % 32 18 15 2 3 4 10 Using the returns shown above, calculate the arithmetic average return, 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., 32.16161.) Average returns Variances Standard deviations