I asked a follow up "lets say you flip two coins and add up how many heads you get. Is it more likely to get 0 or 1 as a result?"
He said "they are equally likely"
aha! I got him. Told him there are 2 ways to get 1 head, but only 1 way to get no heads and he said...
"oh that's like the galton board we made".
I thought i got him and then he started down the path of deriving the central limit theorem.
Geez kid, you are 10, chill out a bit! 😆