So the sum of squares, or we could say the variation due to what's the difference between the groups, between the means, is 24. Now, let's put it all together. We said that the total variation, that if you look at all nine data points, is 30. Let me write that over here. So the sum of squares, the total sum of squares, is equal to 30. We figured out the sum of squares between each data point and its central tendency, its sample mean. We figured out it and we totaled it all up.