Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. XN Year 1 2 3 4 5 Returns Y 7 % 18 % 25 39 14 -8 -15 -22 16 47 Requirement 1: (a)Calculate the arithmetic average return for X. (Click to select) (b)Calculate the arithmetic average return for Y. (Click to select) v 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)