1. Calculate the weighted covariance matrix

2. Calculate each portfolio weight & determine the lowest risk portfolio

	A	B	C	D
Mean	8.9%	8.6%	11.8%	14.7%
Std	12.3%	8.3%	17.6%	15.1%
Covariance Matrix
	A	B	C	D
A	0.015190	0.001628	0.015597	0.014468
B	0.001628	0.006926	(0.001246)	0.002592
C	0.015597	(0.001246)	0.031066	0.021539
D	0.014468	0.002592	0.021539	0.022858