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

$\backslash$table$[[$Year$,$Nominal Return $(\%),$Inflation $(\%)],[2015,0\mathrm{.}2,6\mathrm{.}9],[2016,-16\mathrm{.}0,7\mathrm{.}0],[2017,-14\mathrm{.}0,7\mathrm{.}5],[2018,-42\mathrm{.}5,11\mathrm{.}8],[2019,67\mathrm{.}3,7\mathrm{.}4],[2020,28\mathrm{.}0,4\mathrm{.}0]]$

a$.$ What was the standard deviation of the market returns?

Note: Use decimals, not percents, in your calculations. Do not round intermediate calculati percent rounded to $2$ decimal places.

b$.$ Calculate the average real return.

Note: A negative answer should be indicated by a minus sign. Do not round intermediate calcu a percent rounded to $2$ decimal places.

a$.$ Standard deviation

b$.$ Average real return