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Exxon's return has a 5% standard deviation while United Airlines has a 20% standard deviation. Suppose their returns are perfectly negatively correlated (the correlation is

Exxon's return has a 5% standard deviation while United Airlines has a 20% standard deviation. Suppose their returns are perfectly negatively correlated (the correlation is -1).

A portfolio weight w=___on Exxon yields a zero variance portfolio (answer a number between 0 and 1 with 1 decimal, e.g., 0.5).

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