im taking my final rn please help me out

1) You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 20 percent, -12 percent, 17 percent, 20 percent, and 10 percent.

a.What was the arithmetic average return on Crash-n-Burn's stock over this five-year period?(Do not round intermediate calculations. Enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.)

Average return%

b-1What was the variance of Crash-n-Burn's returns over this period?(Do not round intermediate calculations and round your answer to 5 decimal places, e.g., 32.16161.)

Variance

b-2What was the standard deviation of Crash-n-Burn's returns over this period?(Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.)

Standard deviation%