Please show Excel formulas **

You've observed the following returns on SkyNet Data Corporation's stock over the past five years: 13 percent, -8 percent, 16 percent, 16 percent, and 10 percent. a. What was the arithmetic average return on the stock over this five-year period? (Do not round intermediate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.) Average return 9.4 % b-1.What was the variance of the stock's returns over this period? (Do not round intermediate calculations and round your answer to 5 decimal places, e.g., 32.16161.) Variance b-2. What was the standard deviation of the stock's returns over this period? (Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Standard deviation 0