Right, my point is that the average is 15.9. So if some classrooms have 30 kids and the average is 15.9, that proves the point that there are a lot of classrooms with less than 15.9 kids so that the average is 15.9.
That's the whole point of averages.
Every classroom could have 15.9 kids, but because we like paying people not to do anything, we have 30 kids in one room and (30 + x) / 2 = 15.9 which works to 30 + x = 31.8, x = 1.8
For every 30 kid classroom there can be a classroom with 1.8 kids and the average is 15.9
Which is my whole point that we have a lot of half empty classrooms with teachers collecting a full paycheck while other teachers have overflowing classrooms for the same pay.