Suppose we have the following Treasury bill returns and inflation rates over an eight year period: Year Treasury Bills Inflation 1 9.23% 11.07% 2 10.10 14.66 3 7.84 9.03 4 6.92 6.59 5 7.42 8.79 6 9.73 11.23 7 12.57 15.40 8 14.35 15.20 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? (Negative amount should be indicated by a minus sign. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places, e. g., 32.16.) Average real return %