Assume these are the stock market and Treasury bill returns for a $5-$year period:

$\backslash$table$[[$Year$,$Stock Market Return $(\%),\backslash$table$[[$T$-$Bill$],[$Return $(\%)]]],[2016,34\mathrm{.}50,0\mathrm{.}16],[2017,14\mathrm{.}20,0\mathrm{.}16],[2018,-4\mathrm{.}10,0\mathrm{.}16],[2019,15\mathrm{.}30,0\mathrm{.}03],[2020,24\mathrm{.}60,0\mathrm{.}05]]$

Required:

a$.$ What was the risk premium on common stock in each year?

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 B

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

Note: Do not round Intermediate calculations. Enter your answer as a percent rounded to $2$ decimal places.

Standard deviation

$\%$