The expected returns on Stock X for each of the next $5$ years are as follows:

Year Expected Returns

$110\mathrm{.}00\%$

$2-4\mathrm{.}00\%$

$319\mathrm{.}00\%$

$412\mathrm{.}00\%$

$56\mathrm{.}00\%$

What is the standard deviation of the expected returns on Stock X$?$ Do not round your intermediate calculations and report your final answer as a percentage to $2$ decimal places. $($Hint: You may need to use your answers to the previous problems labeled $13-$PMO to answer this question.$)$