need answer for first two and the last question isnt correct

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. Suppose the average inflation rate over this period was 1.7 percent and the average T-bill rate over the period was 4.6 percent. a. What was the average real return on the company's stock? (Do not round Intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) b. What was the average nominal risk premium on the company's stock? (Do not round intermediate calculations and enter your answer as a percent rounded to 1 decimal place, e.g., 32.1.) % a. Average real return b. Average nominal risk premium % Year 1 2 3 4 5 Returns X Y 16 % 22 % 30 31 11 12 -23 -28 10 22 Using the returns shown above, calculate the arithmetic average returns, the variances, and the standard deviations for X and Y. (Do not round Intermediate calculations. Enter your average return and standard deviation as a percent rounded to 2 decimal places, e.g., 32.16, and round the variance to 5 decimal places, e.g., 16161.) % % Average returns Variances Standard deviations 11% % a. You've observed the following returns on Crash-n-Burn Computer's stock over the past five years: 17 percent, -4 percent, 20 percent, 12 percent, and 10 percent. What was the arithmetic average return on the company's 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.) b-1. What was the variance of the company's returns over this period? (Do not round Intermediate calculations and round your answer to 5 decimal places, e.g., .16161.) b-2. What was the standard deviation of the company'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.) a. Average return b-1. Variance b-2. Standard deviation 11.01% 0.18547 43.07%