Hello, I would greatly appreciate if you could show your steps for the following problems. Thank you!

The table below shows annual returns for stocks of companies X and Y. Calculate the arithmetic average returns. In addition, calculate their variances, as well as their standard deviations. Requirement 1 : (a)The arithmetic average return of company X 's stock is: (b)The arithmetic average return of company Y 's stock is: Requirement 2: (a) The variance of company X's stock returns is: (Do not round intermediate calculations.) (b) The variance of company Y's stock returns is: (Do not round intermediate calculations.) Requirement 3 : (a) The standard deviation of company X 's stock returns is: (Do not round intermediate calculations.) (b) The standard deviation of company Y 's stock returns is: (Do not round intermediate calculations.)