You decide to invest in a portfolio consisting of $25$ percent Stock $x,43$ percent Stock $Y,$ and the remainder in Stock $Z.$ Based on the following information, what is the standard deviation of your portfolio?

$\backslash$table$[[$State of Economy,Probability of State,Return if State Occurs$],[$of Economy,Stock X$,$Stock Y$,$Stock Z$],[$Normal$,\mathrm{.}83,11\mathrm{.}408,4\mathrm{.}808,13\mathrm{.}808],[$Boom$,\mathrm{.}17,18\mathrm{.}708,26\mathrm{.}708,18\mathrm{.}208]]$