Using the following returns, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. Returns Year Y 20% 41 26 15 -10 -16 -24 17 49 Calculate the arithmetic average return for X. Calculate the arithmetic average return for Y. -~345 1 2 X 8% Calculate the variance for X. Calculate the variance for Y. Calculate the standard deviation for X. Calculate the standard deviation for X. Calculate the standard deviation for Y