XD.
I was actually reffering to the fact that you're fretting over exact numbers!
Unless the person dreaming is an "accountant" type or otherwise would have done VAST research into the matter, they would probably know exactly as much about it as you... and so the numbers would presumably work out to about the same as whatever you come up with off the top of your head.
Don't get me wrong, I have nothing against wanting to pay attention to details... but still, why would statistics be more of an issue for a DREAM based setting?