Suppose we have the following returns for large$-$company stocks and Treasury bills over a six$-$year period: YearLarge$-$Company stocksUS Treasury bills$13\mathrm{.}97\%6\mathrm{.}59\%214\mathrm{.}344\mathrm{.}42319\mathrm{.}234\mathrm{.}29414\mathrm{.}457\mathrm{.}32531\mathrm{.}945\mathrm{.}28637\mathrm{.}475\mathrm{.}38$ a$.$Calculate the arithmetic average returns for large$-$company stocks and T$-$bills over this period. $($Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$b$.$Calculate the standard deviation of the returns for large$-$company stocks and T$-$bills over this period. $($Do not round intermediate calculations and enter your answers as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$c$-1.$Calculate the observed risk premium in each year for the large$-$company stocks versus the T$-$bills. What was the average risk premium 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$.,32\mathrm{.}16.)$c$-2.$Calculate the observed risk premium in each year for the large$-$company stocks versus the T$-$bills. What was the standard deviation of the risk premium over this period? $($Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.)$