"In principle, wrote Quetelet, the courage or criminality of a real person could be established... but it was wholly unnecessary for social physics. Instead, the physicist need only arrange that courageous and criminal acts be recorded throughout society, as the latter already were, and then the average man could be assigned a "penchant for crime" equal to the number of criminal acts committed divided by the population. In this way, a set of discrete acts by distinct individuals was transformed into a continuous magnitude... an attribute of the average man."
January 1, 1970
https://en.wikiquote.org/wiki/Adolphe_Quetelet