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In Excel and functions Question 5: Use yearly returns for Microsoft (MSFT), Raytheon Technologies (RTX), and Caterpillar (CAT) from December 31, 1991 to December 31,

In Excel and functions
Question 5: Use yearly returns for Microsoft (MSFT), Raytheon Technologies (RTX),
and Caterpillar (CAT) from December 31, 1991 to December 31, 2021 to answer the
following questions. Assume risk-free rate to be 3.00%. Yearly returns from 1992 to
2021 are required to answer the following questions.
a. Find the variance-covariance matrix using yearly returns. All entries in the
variance-covariance matrix should be calculated using the yearly returns and
should be linked to the yearly returns as well. (6 points)
b. Find the optimal portfolio (i.e., weight of the three assets) by maximizing the
Sharpe ratio of all feasible portfolios. Use yearly mean returns and variance-
covariance matrix for this. (7 points)
c. Find a portfolio (i.e., weight of the three assets) on the efficient frontier with the
expected return of 15%. Use yearly mean returns and variance-covariance matrix
for this. (7 points)

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