Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. Year Y 1 15% 21% 2345 26% 36% 3 7% 13% -13% -26% 11% 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. Arithmetic average return Variance Standard Deviation Y