please help with my easy hw

9. Effects of portfolio size on portfolio risk The following graph plots portfolio risk against the size of the portfolio as measured by the number of stocks in the portfolio. (Hint: Hover the mouse over the graph to read the coordinates.) (?) 50 + 40 30 PORTFOLIO RISK 10 1 0 SH 0 90 100 10 20 30 40 50 60 70 80 NUMBER OF STOCK IN THE PORTFOLIO Based on the data presented in the previous graph, which of the following statements are true? Check all that apply. A portfolio of 40 stocks has a diversifiable risk of 8%. O A portfolio of 80 or more stocks could eliminate almost half of the risk. The market portfolio would have standard deviation of 20%. As the portfolio's size increases, its market risk decreases. The market portfolio would have a standard deviation of about 40%. The benchmark for a well-diversified stock portfolio is the market portfolio, which is a portfolio containing all stocks. The relevant risk of an individual stock is measured by its beta coefficient, which is defined under the Capital Asset Pricing Model (CAPM) as the amount of risk that the stock contributes to the well-diversified portfolio. Based on your understanding of the CAPM and beta, answer the following question: Which of the following is the correct definition of beta coefficient of stock i, b;? O (The Standard Deviation of Stock i's Return/The Standard Deviation of the Market Return) x The Correlation Between Stock i's Return and the Market Return O The Standard Deviation of Stock i's Return/The Standard Deviation of the Market Return O The Standard Deviation of Stock i's Return x The Correlation Between Stock i's Return and the Market Return