Consider the following data : Year 2008 2009 2010 2011 2012 Production (in tons) 60 75 80 70 85 The equation of the straight line trend by the method of least squares is ,

$y=63+5.6x$ $y=74+4.5x$ $y=75.3+2.5x$ $y=95+6.5x$

$y=74+4.5x$