Variance-Covariance Matrix
	Dell	INTC	MSFT	NT			Means
Dell	0.0014	0.0003	-0.0001	-0.0004			8.5000%
INTC	0.0003	0.0280	0.0021	0.0050			4.6000%
MSFT	-0.0001	0.0021	0.0139	0.0023			7.7000%
NT	-0.0004	0.0050	0.0023	0.0066			3.2000%

1. You are given the following information:

Use the Variance Covariance matrix in the Excel file: Efficient Portfolios Data.

Construct a model to determine the following:

1. Standard deviations for the individual assets.
2. Calculate an envelope portfolio assuming the risk-free rate is 5%.
3. Calculate an envelope portfolio assuming the risk-free rate is 12%.
4. Compute the mean and variance for each of these envelope portfolios.
5. Compute the covariance between these two envelope portfolios.