Problem 12-7 Calculating Returns and Variability (LO1] Year 28 Nmt Returns X Y 13% 23% 16 12 15 -11 -12 10 18 2 3 4 5 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, and round the variance answers to 5 decimal places, e.g., .16161.) Y % % Average returns Variances Standard deviations % %