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Using the data in the following table, and the fact that the correlation of A and B is 0

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Using the data in the following table, and the fact that the correlation of A and B is 0.40, calculate the volatility (standard deviation) of a portfolio that is 80% invested in stock A and 20% invested in stock B. (Click on the following icon in order to copy its contents into a spreadsheet.) Year 2008 2009 2010 2011 2012 2013 Realized Returns Stock A Stock B -4% 22% 19% 28% 9% 5% - 1% -9% 5% - 14% 9% 30% The standard deviation of the portfolio is %. (Round to two decimal places.)