An investor has a $$100,000$ portfolio of which $$75,000$ has been invested in Stock A and the

remainder in Stock B$.$ Other characteristics of the portfolio are shown in the accompanying table.

The standard deviation of the portfolio is

Multiple Choice

$9\mathrm{.}39(\%)$

$14\mathrm{.}19(\%).$

$88\mathrm{.}23(\%{)}^2.$

$201\mathrm{.}41(\%{)}^2.$