15. You invested 30% in the stock fund and the rest in the bond fund. The return distribution of the risky funds are shown in the table below. The correlation between the fund returns is 0.2. Expected return 15% Standard deviation Stock fund Bond fund 30% 8% 20% What's the standard deviation of your portfolio? 1) 18% 2) 23% 3) 26% 4) 0%