$\backslash$table$[[$Year$,\backslash$table$[[$Stock Market$],[$Return $(\%)]],\backslash$table$[[$T$-$Bill$],[$Return $(\%)]]],[2013,31\mathrm{.}7,0\mathrm{.}02],[2014,10\mathrm{.}9,0\mathrm{.}02],[2015,-1\mathrm{.}6,0\mathrm{.}02],[2016,13\mathrm{.}0,0\mathrm{.}20],[2017,21\mathrm{.}3,0\mathrm{.}80]]$

Required:

a$.$ What was the risk premium on common stock in each year? $($Negative values should be entered with a negative sign.$)$

b$.$ What was the average risk premium?

c$.$ What was the standard deviation of the risk premium? $($Ignore that the estimation is from a sample of data.$)$

Complete this question by entering your answers in the tabs below.

Required $A$

Required $C$

What was the risk premium on common stock in each year? $($Do not round intermediate calculations. Enter your answers as a percent rounded to $2$ decimal places.$)$

$\backslash$table$[[$Year$,$Risk Premium$],[2013,\%$