Suppose we have the following returns for large$-$company stocks and Treasury bills over a six$-$year period:

$\backslash$table$[[$Year$,$Large$-$Company,US Treasury Bill$],[1,3\mathrm{.}988,6\mathrm{.}628],[2,14\mathrm{.}17,4\mathrm{.}44],[3,19\mathrm{.}31,4\mathrm{.}31],[4,-14\mathrm{.}37,7\mathrm{.}33],[5,-31\mathrm{.}86,5\mathrm{.}36],[6,37\mathrm{.}02,6\mathrm{.}23]]$

a$.$ Calculate the arithmetic average returns for large$-$company stocks and T$-$bills over this time period.

Note: 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 time period.

Note: 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 arithmetic average risk premium over this period?

Note: 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?

Note: Do not round intermediate calculations and enter your answer as a percent rounded to $2$ decimal places, e$.$g$.,32\mathrm{.}16.$

$\backslash$table$[[$a$.$ Large$-$company stocks average return,$\%$