You are asked to evaluate the risk of a portfolio that is long $100 of AAPL and

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You are asked to evaluate the risk of a portfolio that is long $100 of AAPL and short $100 of XOM. The standard deviation of returns for AAPL is 40%. The standard deviation of returns for XOM is 30%. The correlation between the two is 37.5%.

What is the standard deviation of the portfolio? What is the standard deviation of each position separately?

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