Consider the following two funds: Fund A has a mean return of $7\mathrm{.}6\%,$ and asset B has a mean return of $8\mathrm{.}55\%.$ Asset A$\text{'}$s returns have a standard deviation of $2\mathrm{.}65,$ asset B$\text{'}$s returns have a standard deviation of $5\mathrm{.}64,$ and the two assets have a covariance of $0\mathrm{.}7.$ You invested $47\%$ in asset A$.$ What is the overall standard deviation of your portfolio?