Don't need to include the spreadsheet model with the optimal solution. Only need to create a model and solve. Provide the optimal proportion for each stock and the portfolio standard deviation. Please show work

7.Herbert Investments wants to prepare a portfolio comprising three stocks. They would like to earn at least a 9% return at lowest possible risk. LLR 0.07 0.05 LZR 0.09 0.15 TFE 0.1 0.18 MEAN RETURN STDEV OF RETURN (a) LLR CORRELATIONS (R) LLR LZR TFE TFE 0.3 0.5 LZR 0.7 0.7 0.3 0.5 Find the optimal solution using an Excel spreadsheet model and Solver. Attach your spreadsheet model with the optimal solution. a LLR: % LZR: % TFE: % Portfolio standard deviation