Starting from a logically clear concept of probability, based on experience, using arguments which are usually called statistical, we can discover tr… - Richard von Mises

Insurance companies nowadays apply the principle of so-called 'selection by insurance'; this means that they take into consideration the fact that persons who enter early into insurance contracts are on the average of a different type and have a different distribution of death ages from persons from persons admitted to the insurance at a more advanced age.

Remember that algebra, with all its deep and intricate problems, is nothing but a development of the four fundamental operations of arithmetic. Everyone who understands the meaning of addition, subtraction, multiplication, and division holds the key to all algebraic problems.

The main interest of physical statistics lies in fact not so much in the distribution of the phenomena in space, but rather in their succession in time.