Consider the data set of study time and tests grades on a test worth 100 points. Let x represent study time ( in hours) and let y represent grades. x=0,1,2,4,5 y=48,63,75,84, 95. (a)Find the equation of least squares regression line(give a and b to 1 decimal)(b)What percent of the variation is accounted for by linear relationships(round 1 decimal)