Problem 10-7 Calculating Returns and Variability Returns Year Y 1 16 % 20 % 2 19 31 3 - 8 - 17 4 10 15 5 10 21 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 Y : % % Average returns Variances Standard deviations % %