Please help with both questions. Thanks.

The following table lists the annual rates of return on GM stock and the S&P 500 Index. Annual Rates of Return Year GM 1 0.100 0.150 0.080 S&P 500 0.090 0.224 0.273 0.080 -0.120 -0.100 -0.060 0.170 0.090 (b) compute the sample beta value for General Motor; (c) computer the sample non-systematic risk for General Motor