*A person who compiles and analyses statistics and uses them to calculate insurance risks and premiums.
An actuary and a farmer were travelling by train. When they passed a flock of sheep in a meadow, the actuary said, "There are 1248 sheep out there." The farmer replied, "Amazing. By chance, I know the owner, and the figure is absolutely correct. How did you count them so quickly?" The actuary answered, "Easy, I just counted the number of legs and divided by four.