4 200 200 150 150 100 100 501 50 X 10 20 30 X 40 10 O 20 30 40 decimal places.) (b) Verify the given sums Ex, Zy, Ex2, Zy2, Ex y, and the value of the sample correlation coefficient r. (For each answer, enter a number. Round your value for r to three Ex = Ey = Ex2 = Ey2 = Ex y.= r = (c) Find x, and y. Then find the equation of the least-squares line y = a + b x. (For each answer, enter a number. Round your answers for x and y to two decimal places