Suppose we have the following Treasury bill returns and inflation rates over an eight year period: Year Treasury Bills Inflation 1 9.87% 11.87% 2 10.76 15.36 3 8.48 9.69 4 7.78 7.43 5 8.30 9.69 6 10.63 12.15 7 13.49 16.34 8 15.31 16.22 a. Calculate the average return for Treasury bills and the average annual inflation rate for this period. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Treasury bills % Inflation % b. Calculate the standard deviation of Treasury bill returns and inflation over this period. (Do not round intermediate calculations. Enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Treasury bills % Inflation % c. What was the average real return for Treasury bills over this period?