Suppose we have the following Treasury bill returns and inflation rates over an eight- year period: Treasury Bills 7.70% Year Inflation 9.20% 8.46 6.31 2 12.88 3 7.41 5.48 5.24 4 5 5.89 717 6 8.11 9.52 7 11.10 13.84 12.70 13.19 a. Calculate the arithmetic average return for Treasury bills and the average annual inflation rate (consumer price index) 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 Inflation 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 Treasury bills Inflation c. What is 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 return