Percent of portfolio stock X:$38\%$ stock y: please calculate Average annual return stock x:$4\mathrm{.}77\%$ stock y: $6\mathrm{.}03\%$ standard deviation of returns stock x: $7\mathrm{.}6\%$ stock y:$11\mathrm{.}6\%$ covariance of returns: $10$ calculate the standard deviation of the portfolio using markowitz formula round to $2$ decimal places