Given the following variance-covariance matrix and expected returns vector (for assets X and Y, respectively) for a two-asset world:
a) What is the expected return of a zero-beta portfolio, given that 50% of the index portfolio is invested in asset X and in asset Y?
b) What is the vector of weights in the global minimum variance portfolio?
c) What is the covariance between the global minimum variance portfolio and the zerobeta portfolio?
d) What is the equation of the market line?