How do we get the value for sigma x^2i and Sigma y^2i? I cannot get the same answers in the question.

Example 8.4. As gas prices climb. the Canadian government considers giving auto manufacturers subsidies to produce electric cars. However, it wants to quantify the relationship between the number of electric cars purchased and gas prices before proceeding. It collects the following data from the past ten years. Gas prices are measured in cents per litre and the number of electric cars purchased is measured in thousands of units. Year 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 Electric Cars Purchased 45 75 80 99 101 104 111 128 132 175 187 It is determined that Emi = 1221, Est-3 = 149641, Em = 1050, 2y? = 121622, and Z sciyi- : 130626