6 1 point Ptolemy borrowed $3,370 at the risk-free rate and invested the borrowed funds, plus $9,628 of his own money in asset X. Calculate the standard deviation of his complete portfolio. Express your answer as a decimal with four digits after the decimal point (e.g., 0.1234, not 12.34%). Asset Expected Return Standard Deviation 0 0.25 F X 0.04 0.15 0.25