9. The following calculations have been made for prices of twelve stocks ( X ) at the Calcutta Stock Exchange on a certain day along with the volume of sales in thousands of shares ( Y ). From these calculations find the regression equation of price of stocks on the volume of sales of shares. EX = 580, EY = 370, EXY = 11494, EX' = 41658, E Y?= 17206. 10. Given two regression lines 3X - 3Y + 9 = 0 and 4X - Y = 8. Find the two regression co- efficients and regression equations. Also find the correlation co-efficient