What is 2 + 2

The accountant says, “What do you want it to be?”

The mathematician says, “I believe it’s 4, but I’ll have to prove it.”

The statistician says, “The sample is too small to give a precise answer, but based on the data set, there is a high probability it is somewhere between 3 and 5.”

The engineer says, “The answer is 4, but I’ll have to add a safety factor so we’ll call it 5.”