10.5 Several years ago, the Value Line Investment Surn s of se the following market betas for the stocks of selected he providers: Company Quorum HealthGroup Beverly Enterprises HEALTHSOUTH Corporation United Healthcare Beta 0.90 1.20 1.45 1.70 At the time these betas were developed, reasonable estimates for the risk-free rate, RF, and required rate of return on the market, R(R), were 6.5 percent and 13.5 percent, respectively a. What are the required rates of return on the four stocks