Which are governed by the same rng, so what I said applies here. The bias is also the same. I doubt you wrote down all the times when your CC hit all the enemies and got mad "how can it be everybody failed their saves bla bla bla".Also I am talking about enemy rolls, not my own.
The problem with enemies saving in this game isn't the RNG but the fact that they have generally too high saves, which means they often don't have to roll very high to succeed.