calculate the expected return and variance of portfolios invested

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 36% per year. Assume these values are representative of investors' expectations for future performance and that the current T-bill rate is 6%. Calculate the expected return and variance of portfolios invested in T-bills and the S&P 500 index with weights as shown below. (Enter your answers as decimals rounded to 4 places. Leave no cells blank - be certain to enter "O" wherever required.) WBills 0.0 WIndex Expected Return 1.0 0.1400 0.2 0.4 0.6 0.8 0.6 0.4 0.8 0.2 1.0 0.0 0.0600 lata showing that rate of return on the er the past 85 roughly 8% more I return and that rd deviation has year. Assume resentative of ins for future at the current T-bill ted return and s invested in T-bills dex with weights as your answers as o 4 places. Leave ertain to enter "0" Expected Return 0.1400 Variance 0.1296 Example 0.0600 0