You decide to invest in a portfolio consisting of $20$ percent Stock X$,41$ percent Stock Y$,$ and the remainder in Stock Z$.$ Based on the following information, what is the

standard deviation of your portfolio?

Multiple Choice

$7\mathrm{.}22\%$

$4\mathrm{.}95\%$

$2\mathrm{.}45\%$

$1\mathrm{.}84\%$

$6\mathrm{.}19\%$