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 23% per year. Assume these values are representative of investors' expectations for future performance and that the current T-bill rate is 6% Calculate the utility levels of each portfolio for an investor with A-2. Assume the utility function is U= 80 -0.5 * Ao? (Do not round intermediate calculations. Round your answers to 4 decimal places.) WBills U(A-2) 0.0 Windex 1.0 0.8 0.2 0.4 0.6 0.6 0.8 1.0 0.4 0.2 0.0