Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. Year 1 2 3 4 Returns 15 % 20 % 33 41 22 -10 -23 -24 24 49 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)