Using the data in the following? table, and the fact that the correlation of A and B is 0.59?, calculate the volatility? (standard deviation) of a portfolio that is 80% invested in stock A and 20% invested in stock B.
Stock A Stock B
2005 -7 13
2006 15 28
2007 6 15
2008 -5 -7
2009 4 -4
2010 6 34
The Standard deviation of the portfolio is ___%.
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