2nd pic is the hint. thanks

Eric Poppovich invests money in two stocks for the upcoming year. His investment is shown below: The correlation between LBJ and Duncan is 0.50. What is the standard deviation of the portfolio? Answer format: Percentage Round to: 2 decimal places (Example: 9.24\%, \% sign required. Will accept docimal format rounded to 4 decimal places (ex: 0.0924)) Eric Poppovich invests money in two stocks for the upcoming year. His investment is shown below: The correlation between LBJ and Duncan is 0.50. What is the standard deviation of the portfolio? SOLUTION: Portfoliovariance=2=wA2xA2+wB2xB2+2xA,BxwAxwBxAxB 2=.5812x.162+.4192x.202+20.50x0.5810.419x.16x.20=.0235 =.0235=0.1532=15.32% Where did the weights come from? See below: wA=TotalInvestedinPortfolioTotalInvestedinStockA=Totalinvestedinportfollo#ofsharesxPricepershare Total invested in Stock A=40$36.00=$1,440.00 Total invested in Stock B=20x$52.00=$1,040.00 Total invested in portfolio = Total invested in Stock A+ Total invested in Stock B Total invested in portfolio =$1,440+$1,040=$2,480 wA=$2,480$1,440=0.581=58.1%wB=1wA=1.581=.419=41.9%