Year Company A Company B1 12.6 8.32 18.7 -23.53 11.3 -2.24 -9.8 24.95 2.4 11.8mean ? ?std.dev. 11.0695 18.1020a) Find the missing values for Company A and Company B stock.b) If you kept the stock two years in your portfolio with 75% in Company A and 25% in Company B what was your return and risk of the portflio combination?