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=12% y=25%

Year 2, x= 28% y=34%

Year 3, x=9% y=-13%

Year 4, x= -7% y= -27%

Year 5, x= 10%, y = 14%

Please use equation not excel in details and show formula....thanks!