Consider the rate of return of stocks ABC and XYZ rABC 20% 10 12 Year 27% 12 17 -6 a. Calculate the arithmetic average return on these stocks over the sample period Arithmetic Average ABC XYZ b. Which stock has greater dispersion around the mean return? ? ABC c. Calculate the geometric average returns of each stock. What do you conclude? (Do not round intermediate calculations. Round your answers to 2 decimal places.) Geometric Average ABC XYZ