Last Question

A mathematician, statistician and accountant were finalist for a position as VP in a large corporation. The hiring committee asked them all the same last question:
The mathematician was first. "How much is 500 plus 500 ?", they asked
"1000" he replied without hesitation.
"Thank you", they dismissed him.
Next the statistician. "How much is 500 plus 500?"
On the average, 1000 with 95 % confidence replied the statistician
"Thank you", they dismissed him.
Next the accountant."How much is 500 plus 500?"
What would you like it to be? responded the accountant.
They hired the accountant.