Assume the annual average return on the S&P500 is 13.7% with a standard deviation of 17.5%. A risk-free asset has an annual average return of 4.0% with a standard deviation of 0.0% and a correlation with the S&P500 index of +0.00. An investor invests 60% of his portfolio in the S&P500 and the rest in the risk-free asset. The standard deviation of the investor’s portfolio is Assume the annual average return on the S&P500 is 13.7% with a standard deviation of 17.5%. A risk-free asset has an annual average return of 4.0% with a standard deviation of 0.0% and a correlation with the S&P500 index of +0.00. An investor invests 60% of his portfolio in the S&P500 and the rest in the risk-free asset. The standard deviation of the investor’s portfolio is