The following table shows the nominal returns on Brazilian stocks and the rate of inflation.

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.

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.