Assuming the correlation between stocks and bonds is negative (-1), compute the standard deviation of the combined risky_portfolio (use % and two decimals) Assets Portfolio Allocation % Expected Rate of Expected Standard Return Deviation Risk-Free Assets T-Bills 20% 2.0% 0 Risky Assets Bonds Stocks 10% 50% 30% 6.0% 20.0% 34% 5.72% 6.25% 6.50% 5.20%