3. Security Y has the following returns over five years: 3%, 6%, 0%, 6%, and 3%. What is the mean return and the standard deviation (sample) for Security Y? a. Mean of 3.6% and standard deviation of 6.4%. b. Mean of 3.6% and standard deviation of 2.5% c. Mean of 3.0% and standard deviation of 6.4%. d. Mean of 3.0% and standard deviation of 2.5%. 4. Portfolio A has a weighted beta coefficient of 1.5 and Portfolio B has a weighted beta coefficient of 0.9. With these assumptions, which of the following statements is correct? a. Because Portfolio A has a beta greater than 1.2, it is a better choice for most investors. b. Assuming the market were to drop by 5%, Portfolio B should drop less than Portfolio A. c. Neither portfolio is as volatile as the market. d. All of the above are correct