4. Stock offer an expected rate of return of 18%, with a standard deviation of 22%. Gold offers an expected return of 10% with a standard deviation of 30%. a. In light of apparent inferiority of gold with respect to both mean return and volatility, would anyone hold gold? If so, demonstrate graphically why one would do so. b. Given the data above, reanswer (a) with additional assumption that correlation coefficient between stock and gold equals 1 . Draw a graph illustrating why one would or would not holc gold in one's portfolio. c. Could the set of assumption in part (b) for expected returns, standard deviations and correlation represent an equilibrium for security market