Only yesterday the practical things of today were decried as impractical, and the theories which will be practical tomorrow will always be branded as… - William Feller

This means that if in a city seven accidents occur each week, then (assuming that all possible distributions are equally likely) practically all weeks will contain days with two or more accidents, and on the average only one week out of 165 will show a uniform distribution of one accident per day.

three repairman per twenty machines are much more economical than one repairman per six machines.

The classical theory of probability was devoted mainly to a study of the gamble's gain, which is again a random variable; in fact, every random variable can be interpreted as the gain of a real or imaginary gambler in a suitable game.