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Using the data in the following table, calculate the volatility (standard deviation) of a portfolio that is 72% invested in stock A and 28% in stock B

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Using the data in the following table, calculate the volatility (standard deviation) of a portfolio that is 72% invested in stock A and 28% in stock B. 
The volatility of the portfolio is 
%. (Round to two decimal places.) 
0 Data Table 
(Click on the following icon iii in order to copy its contents into a spreadsheet.) 
Year 2010 2011 2012 2013 2014 2015 Stock A - 1% 6% 1% - 1% 3% 13% Stock B 18% 3% 23% - 6% - 8% 22%