Suppose we have the following Treasury bill returns and inflation rates over an eight-year period Treasury Bills Inflation 10.40% 13.96 8.39 6.04 8.15 10.56 14.70 14.33 Year 8.62% 9.46 7.23 6.34 6.81 9.09 11.90 13.62 2 3 4 6 8 a. Calculate the average return for Treasury bills and the average annual inflation rate for this period. (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Average return Treasury bills 0 Inflation 0 b. Calculate the standard deviation of Treasury bill returns and inflation over this period. (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g 32.16.) Standard deviation 0 Treasury bills Inflation 0 c. What was the average real return for Treasury bills over this period? (A negative answer should be indicated by a minus sign. Do not round intermediate calculations and enter your answer as a percent rounded to 2 decimal places, e.g., 32.16.) Average real returrn