Stocks A and B have the following historical returns:

$\backslash$table$[[$Year$,\backslash$table$[[$Stock A$\text{'}$s Returns, r$\_($A$)],[(\%)]],\backslash$table$[[$Stock B$\text{'}$s Returns, r$\_($B$)],[(\%)]]],[2016,(16\mathrm{.}0),(12\mathrm{.}2)],[2017,33\mathrm{.}5,22\mathrm{.}3],[2018,15\mathrm{.}8,32\mathrm{.}2],[2019,(0\mathrm{.}8),(9\mathrm{.}2)],[2020,26\mathrm{.}0,25\mathrm{.}4]]$

$($i$)$ Calculate the average return for each stock during the period $2016$ to $2020.$

$($ii$)$ Assume that someone held a portfolio consisting of $50\%$A and $50\%B.$ What would have been their realized rate of return on the portfolio in each year from $2016$ to $2020?$ What would have been the average return on the portfolio during this period?

$($iii$)$ Calculate the standard deviation of returns for each stock and for the portfolio.

$($iv$)$ Calculate the coefficient of variation for each stock and for the portfolio.

$($v$)$ Assuming you are a risk$-$averse investor, would you prefer to hold Stock A$,$ Stock B$,$ or the portfolio? Why?