Need help with the excel formulas for this problem. Thanks

You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 7 percent, -13 percent, 21 percent, 34 percent, and 15 percent. What was the arithmetic average return on the stock over this five-year period? What was the variance of the returns over this period? The standard deviation? Complete the following analysis. Do not hard code values in your calculations. Squared Deviation Deviation Year 1 2 3 4 5 Actual Return 0.07 (0.13) 0.21 0.34 0.15 Sum= Squared deviation total = Average return = Variance = Standard Deviation =