The following table lists the annual rates of return on GM stock and the S&P 500 Index Annual Rates of Return Year GM S&P 500 0.140 0.020 2 0.050 0.080 0.230 0.260 4 0.125 0.075 0.100 0.020 0.020 0.160 (Keep your answers to 4 decimal places, e.g. xxx.1234.) 1. Calculate the sample mean rates of return for GM and the S&P 500 Index. GM: S&P 500 2. Calculate the sample covariance between returns for GM stock and the S&P 500 Index Sample covariance