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An investor has 50% of his portfolio in the risk-free asset and 50% in Exxon Mobil stock

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An investor has 50% of his portfolio in the risk-free asset and 50% in Exxon Mobil stock. The risk-free rate is 0.2%, and Exxon's expected return is 10% with a standard deviation of 16%. What is the expected risk of this portfolio?