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Standard deviation of a stock portfolio with two companies

Company A stock has exhibited a standard deviation in returns of 0.5, whereas Company B tock has exhibited a standard deviation of 0.9. The correlation coefficient between the stock returns is 0.2. What is the standard deviation of a portfolio composed of 65% Company and 45% Company B?

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Company A stock has exhibited a standard deviation in returns of 0.5, whereas Company B tock has exhibited a standard deviation of 0.9.  The correlation coefficient between the stock returns is 0.2.  What is ...

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