Problem 6-11 Consider historical data showing that the average annual rate of return on the S&P 500 portfolio over the past 85 years has averaged roughly 8% more than the Treasury bill return and that the S&P 500 standard deviation has been about 35% per year. Assume these values are representative of investors' expectations for future performance and that the current T-bill rate is 3%. Calculate the utility levels of each portfolio for an investor with A= 2. Assume the utility function is U= ED) - 0.5 * Ao2. (Do not round intermediate calculations. Round your answers to 4 decimal places.) U(A =2) WBills 0.0 WIndex 1.0 0.2 0.4 0.6 0.8 0.6 0.8 0.4 0.2 0.0: 1.0