Hi, I used the standard deviation of the nominal returns formula, real return formula, and average real return and got it wrong. Can someone work on this and elaborate for me? Thanks!

The following table shows the nominal returns on Brazilian stocks and the rate of inflation. Year 2012 2013 2014 2015 2016 2017 Nominal Return (%) 0.4 -17.0 -15.0 -43.0 67.8 28.5 Inflation (%) 7.4 7.5 8.0 12.3 7.9 4.5 a. What was the standard deviation of the market returns? (Use decimals, not percents, in your calculations. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places.) Answer is complete but not entirely correct. Standard deviation 1.45 X % b. Calculate the average real return. (A negative answer should be indicated by a minus sign. Do not round intermediate calculations. Enter your answer as a percent rounded to 2 decimal places) * Answer is complete but not entirely correct. Average real return 0.06 X %