9. Suppose that the standard deviation of returns from atypical share is about .40 (or 40 percent) a year. The correlation between the returns of each pair of shares is about .3. a. Calculate the variance and standard deviation of the retums on a portfolio that has equal investments in two shares, three shares, and so on, up to 10 shares. Plot your results. b. Use your estimates to draw a graph to show the relationship between the number of securities and risk. How large is the underlying market risk that cannot be diversified away? Plot your results