Calculate the expected return and standard deviation for the following portfolios:
1. All in Z
2. 0.75 in Z and .25 in Y
3. 0.5 in Z and .5 in Y
4. 0.25 in Z and .75 in Y
5. All in Y
(b) Draw the mean-standard deviation frontier.
(c) Which portfolios might be held by an investor who likes high mean and low standard deviation? (In other words, which portfolios are on the efficient frontier?)