Probably very easy question

[LetsRock]

My personal theory on dealt cards distribution is this. There are 20 cards dealt ten handed. A very informal form of probablity tells me that there will be about 1.5 of each rank dealt. Using that very loose "formula" (it's not scientific by any means), I usually assume that there 2 Aces out in every deal. If I have one, then someone else likely has exactly one. If I have two, there's a pretty good chance that noone else has one.

Now, I don't live and die under this theory - I just use it as a rough guide to help me put people on hands......