We construct four portfolios by investing different weights in two stocks. The expected return and STD of these portfolios are given below.
Portfolio Expected Return Standard Deviation
W 8.25% 20%
X 8.75% 15%
Y 8.5% 20%
Z 9% 15%
Which of the following portfolios is on the efficient frontier?
a. Only portfolio W is on the efficient frontier.
b. Only portfolio X is on the efficient frontier.
c. Only portfolio Y is on the efficient frontier.
d. Only portfolio Z is on the efficient frontier.