## Is QM truly random and many world theory

Hi everybody,

i didn't wanted to create two separate threads so merged them into one.

i got confused watching Brian Green explaining QM on one of his shows.
He compared distribution in double slit experiments with throwing a ball on a roulette.
He said that casino doesn't have to know where ball on roulette wheal is going to land, but casino knows that in the long run that he is going to get some kind of distribution. In other words, when we shoot electrons through double slit, we can't know for sure where it will go but we know that it will follow normal distribution. But in principle ball and roulette table follows Newtonian laws and if we had all the data we need, we could say with 100% certainty where will ball land. Does the same principle apply in QM i.e. if we had all the data we need we could say where the electron land? If that is the case then is QM truly random? On the other hand if we had all the data and we still couldn't predict where electron will land then it seems to me that QM is truly random. Also does qm behaving random drives stake through the heart of fatalism and predeterminism?

Second question is about many worlds theory. Here is video where Sean Carroll explains a many world theory, and he uses example of a car choosing which why to go. Now, i hope that this many world theory has nothing to do with actual cars choosing which way to go i.e. when actual car chooses which way to go he doesn't create a new world, but rather all of this is on a microscopic level.

Thank you.
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