Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. Year 1 2 3 4 5 15% 26% 7% -13% 11% Y 21% 36% 13% -26% 15% Complete the following analysis. Do not hard code values in your calculations. Make sure to use the "sample" Excel formulas in your calculations. You must use the built-in Excel functions to answer this question. Y Arithmetic average return Variance Standard Deviation