You have observed the following information below:

Security	Expected return	Standard deviation
1	9%	0.3
2	7%	0.2

Now, you know the correlation between security 1 and 2 is -1. Please find 1) the minimum standard deviation portfolios weights; 2) the standard deviation of the minimum standard deviation portfolio; 3) the expected return of the minimum standard deviation portfolio; 4) In a normal market, what must be the risk-free rate of interest? (Hint: please refer to pages 44-47 of slide deck 9).