I could use assistance with all of these.. Questions 13 and 14 in particular. Thank you so much!!

11 Following are the betas of three companies in an investors portfolio, and the asset values Beta Dollars Stock A 1.43 6,250 3,000 3.250 12,500 1.06 Stock B Stock C 0.87 Calculate the portfolios beta 1.52 a 1.43 b 1.32 C 1.20 d 12 Beta coefficients are calculated the same way by all major data services such as Yahoo, Bloomberg, and Value lin TRUE FALSE 13 Following are the returns of three companies in an investors portfolio, and the asset values Return 5.00% Dollars 6,250 3,000 3.250 12,500 Stock A Stock B 6.25% Stock C 10.00% Calculate the portfolios return 0.50% b 1.50% 3.90% C 6.60% 14 Following are the standard deviations of three companies in an investors portfolio, and the asset values Return Dollars 6,250 65.79% 3.250 34.21% 9,500 Stock A 6.35% 4.18% 19.35% Stock B 6.62% 100.00% 10.80% Calculate the portfolios standard deviation 19.07% a This is correct answer b 14.06% 11.25% C unable to calculate this portfolio's standard deviation without know ing correlation coefficient d