cumulative sum is not done that way dear... x1/y1 x2/y2 is not equal to (x1 x2)/(y1 y2)... the second one is the cumulative run-rate, while the first one is average of the run-rates (which has no mathematical significance, since all matches do not last equal overs, i.e., y1, y2, y3 are different for each team)... time to get back to Class VII algebra, right buddy?
