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9. Florida Company (FC) and Minnesota Company (MC) are both service companies. Their historical return for the past three years are: FC: -5%, 15%, 20%; MC: 8%, 8%, 20%. Calculate the variances of return for FC and MC.

11. The historical returns data for the past three years for Stock B and the stock market portfolio are: Stock B: 24%, 0%, 24%, Market Portfolios: 10%, 12%, 20%. Calculate the covariance of returns between Stock B and the market portfolio.

12. The historical returns data for the past four years for Stock C and the stock market portfolio returns are: Stock C: 10%, 30%, 20%,20%; Market Portfolio: 5%, 15%, 25%, 15%. Calculate the beta for the stock: