Year Consolidated Edison Central Valley Community Bancor 2008 -15.9% -43.6% 2009 23.5% -10.2% 2010 14.7% 1.5% 2011 31.3% -3.3% 2012 -6.4% 43.1% 2013 4.2% 47.7% 2014 24.9% 0.4% 2015 1.1% 10.6% 2016 18.9% 69.1% 2017 19.5% 2.4%

This Table,contains the annual returns from 2008 to 2017 for two stocks, Consolidated Edison (ED) and Central Valley Community Bancor (CVCY). Use Excel to create a spreadsheet that calculates the average, standard deviation, and correlation coefficient for the two stocks. Just comparing the two stocks in isolation, does one seem more attractive tan the other? Next, calculate the average return and standard deviation for several portfolios, starting with one that invests 100% in ED and 0% in CVCY, then decreasing the percent invested in ED and increasing the investment in CVCY in 10% increments until you reach a portfolio of 0% ED and 100% CVCY (that would be 11 portfolios total). Draw a graph showing the standard deviation (x-axis) and average return (y-axis) for each portfolio. What lesson does this exercise illustrate?