Using the following returns, calculate the average arithmetic returns, the variances, and the standard deviation for x and y.

Calculate the variance for x and y, Standard deviation x and y

Year 1, x=8% y=21%

Year 2, x= 26% y=42%

Year 3, x=15% y=-10%

Year 4, x=-16% y= -24%

Year 5, x= 17%, y = 50%

Please use equation not excel in details....thanks!