Using the data in the following table, estimate the average return and volatility for each stock.
Stock A Stock B
2005 -6 18
2006 20 28
2007 4 11
2008 -7 -8
2009 3 -7
2010 14 23
The return of stock A is ___%
The return of stock B is ____%
The variance of stock A is ____.
The variance of stock B is ____.
The standard deviation of stock A is ___%
The standard deviation of stock B is ___%