3. Use the Variance-Covariance matrix in the Excel file: Efficient Portfolios Data. Construct a model to determine the following: a. Calculate an envelope portfolio assuming the risk-free rate is 5%. b. Calculate an envelope portfolio assuming the risk-free rate is 20%. c. Using EXCEL's Data Table Feature, create a one-way data table that determines the different means and standard deviations for combinations of Envelope Portfolio 1 and Envelope Portfolio 2 by varying the proportion of Portfolio 1 from 3 to +3 in increments of 0.30 d. Graph the combinations of the portfolios from the oneway data table and add the individual asset means and standard deviations to the graph. e. Provide a title on the graph and label the axes of the graph. f. Using EXCEL's Text Box feature, explain whether the portfolio combinations could be on the efficient frontier. Efficient Portfolios Data 3. Use the Variance-Covariance matrix in the Excel file: Efficient Portfolios Data. Construct a model to determine the following: a. Calculate an envelope portfolio assuming the risk-free rate is 5%. b. Calculate an envelope portfolio assuming the risk-free rate is 20%. c. Using EXCEL's Data Table Feature, create a one-way data table that determines the different means and standard deviations for combinations of Envelope Portfolio 1 and Envelope Portfolio 2 by varying the proportion of Portfolio 1 from 3 to +3 in increments of 0.30 d. Graph the combinations of the portfolios from the oneway data table and add the individual asset means and standard deviations to the graph. e. Provide a title on the graph and label the axes of the graph. f. Using EXCEL's Text Box feature, explain whether the portfolio combinations could be on the efficient frontier. Efficient Portfolios Data