Suppose we have the following Treasury bill returns and inflation rates over an eight year period: Year Treasury Bills Inflation 1 9.47 11.32 2 10.35 14.93 3 8.08 9.28 4 7.15 6.81 5 7.66 9.04 6 9.98 11.49 7 12.83 15.67 8 14.63 15.53 a. Calculate the average return for Treasury bills and the average annual inflation rate (consumer price index) for this period. (Round your answers to 2 decimal places. (e.g., 32.16)) Treasury bills 10.02 % Inflation 11.76 % b. Calculate the standard deviation of Treasury bill returns and inflation over this period. (Do not round intermediate calculations and round your final answers to 2 decimal places. (e.g., 32.16)) Treasury bills 2.59 % Inflation 3.33 % c. What was the average real return for Treasury bills over this period? (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places. (e.g., 32.16)) Average real return %