Keith holds a portfolio that invests equally in three stocks (w_x = w_y = w_z = 1/3). Each of the three stocks is described below: Keith Is concerned about risk, but he realizes there is a difference between the risk of an asset if it is held in isolation and the risk of an asset if it is held within a portfolio. Identify which stock has the most risk by each definition. The risk-free rate (r_RF) is 6% and the market risk premium (R_PM) is 4%. Calculate the portfolio's beta and use the Capital Asset Pricing Model (CAPM) to calculate its required return. Suppose Keith sold his shares in Stock Z and used the proceeds to buy a new stock with a different beta. If Keith wants his new portfolio to hove a required return of 11.2%, what does the beta of the new stock have to be