P12-7 Calculating Returns and Variability [L01] Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y Returns Year 2 4 12% 30 19 20 21 22% 43 -7 21 51 Requirement 1 (a) Calculate the arithmetic average return for X (Click to select) (b) Calculate the arithmetic average return for Y (Click to select) Requirement 2 (a) Calculate the variance for X. (Do not round intermediate calculations.) (Click to select) (b) Calculate the variance for Y. (Do not round intermediate calculations.) (Click to select) Requirement 3 (a) Calculate the standard deviation for X. (Do not round intermediate calculations.) (Click to select) (b) Calculate the standard deviation for Y. (Do not round intermediate calculations.) (Click to select)