Using the table below, calculate the portfolio standard deviation with an allocation of 25% in security A, 25% in security B, and 50% in security C. Time B. % C, % D, % Mkt, % A,% 18.56 1 18.23 12.82 12.43 12.28 2 15.27 18.24 -5.99 13.45 4.32 3 14.12 -1.57 -5.82 12.58 -7.43 14.71 -6.56 12.41 -4.48 4 -8.54 5 9.12 12.45 12.21 13.41 13.16 21.22 6 1-6.34 17.54 -8.12 14.32 52.29 62.73 O 7.23 7.92