A company dealing in statistical analysis is hiring. Three recent graduates are invited for an interview: one has a degree in mathematics, another one in computer science, and the third one obtained his B.Sc. in statistics.
All three are asked the same question: “What is one third plus two thirds?”
The mathematician: “It’s one.”
The computer scientist takes out his pocket calculator, punches in the numbers, and replies: “It’s 0.999999999.”
The statistician: “What do you want it to be?”