Environtech Engineering, a company that specializes in the construction of antipollution filtration devices V has recorded the following sales record over the las lm9 years : 9, Year 2003 2004 | 2005 2006 2007 | 2008 | 2009 | 2010 | 2011 Sales ( in Rs. 13 15 19 21 27 35 47 49 57 10 Lakhs) (a) Plot these data. (b) Develop the linear estimating equation that best describes these data. (c) Plot the line obtained in part (b) on the graph from part (a).

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