What's the standard deviation of the portfolio

Using the data in the following table, and the fact that the correlation of A and B is 0.36, calculate the volatility (standard deviation) of a portfolio that is 50% invested in stock A and 50% invested in stock B. (Click on the following icon in order to copy its contents into a spreadsheet.) Realized Returns Year 2008 2009 2010 2011 2012 2013 Stock A -7% -7% 1% 6% The standard deviation of the portfolio is Stock B 70/0 (Round to two decimal places.) Using the data in the following table, and the fact that the correlation of A and B is 0.36, calculate the volatility (standard deviation) of a portfolio that is 50% invested in stock A and 50% invested in stock B. (Click on the following icon in order to copy its contents into a spreadsheet.) Realized Returns Year 2008 2009 2010 2011 2012 2013 Stock A -7% -7% 1% 6% The standard deviation of the portfolio is Stock B 70/0 (Round to two decimal places.)