13) What is the expected return (simple average) if stock returns followed this historical distribution: +15%, -10%, -25%, and +15%? 14) What is the SAMPLE standard deviation if stock returns followed this historical distribution: +15%, - 10%, -25%, and +15%? 15) What methods can we use to estimate the equity premium in CAPM? 16) Pearson Motors has a target capital structure of 50% debt and 50% common equity, with no preferred stock. The yield to maturity on the company's outstanding bonds is 9%, and its tax rate is 40%. Pearson's CFO estimates that the company's WACC is 8%. What is Pearson's cost of common equity