Calculate the coefficient of correlation using the method of concurrent deviation between supply and demand of an item for a period of 10 years as given below : 2011 Year 2008 2009 2010 2012 2013 2014 2015 2016 2017 Supply 125 160 164 174 155 170: 165 162 172 175 Demand 115 125 192 190 165 174 124 127 152 169

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