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

Year Stock Market Return $(\%)$ T$-$Bill Return $(\%)$

$201634\mathrm{.}200\mathrm{.}14$

$201713\mathrm{.}900\mathrm{.}14$

$20183\mathrm{.}800\mathrm{.}14$

$201914\mathrm{.}800\mathrm{.}09$

$202024\mathrm{.}300\mathrm{.}11$

Required:

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

What was the average risk premium?

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