P12-7 Calculating Returns and Variability [LO1] Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. Returns Year 11 % NMto 24 % 2945 18 -10 -24 53 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)