The variance of the annual returns for the Jet Blue Airlines and Chick$-$Fil$-$A stocks are $0\mathrm{.}2064$ and $0\mathrm{.}1057,$ respectively. The covariance between the annual returns on these two stocks is $0\mathrm{.}0819.$ if the portfolio consists of $70$ percent Jet Blue Airlines stock and $30$ percent Chick$-$Fil$-$A stock, the portfolio covariance is:$\mathrm{.}14965\mathrm{.}14504\mathrm{.}14235\mathrm{.}14737$