The code is wrong because there is an assumption that the distribution is 50% for 10$ and 50% for 20$. There no basis for this (how do you know you won't got 40

The code is wrong because there is an assumption that the distribution is 50% for 10$ and 50% for 20$. There no basis for this (how do you know you won't got 40$ if you see 20$ ?). See my other posts, I think this point is very well worth thinking about.