There is much food for thought in Richter. You would not think it, to look at them. There is no a priori probability about it. He remarks that, while the individual man is an insoluble puzzle, in the aggregate he becomes a mathematical certainty. You can, for example, never foretell what any one man will do, but you can say with precision what an average number will be up to.
Individuals vary, but percentages remain constant.
So says the statistician. I think she is one of the most charming young ladies I ever met, and might have been most useful in such work as we have been doing. I should never marry myself, lest I bias my judgment. You have done all the work in this business. And he stretched his long white hand up for it.