My answer for the T-bills was correct, but the Large-company stock is apparently wrong. I do not know what I am doing wrong. Your help is greatly appreciated!

Consider the following table for a period of six years: Returns Year Large-Company Stocks -15.49% 26.71 37.39 24.09 7.48 6.73 U.S. Treasury Bills 2 4 5 6 8.07 6.03 5.87 5.53 7.88 Calculate the arithmetic average returns for large-company stocks and T-bills over this time period. (Do not round intermediate calculations and enter your answers as a percent rounded to 2 decimal places, e.g., 32.16.) Arithmetic average returns 18.53 % Large-company stock T-bills 6.81 %