The universe isn't deterministic as far as we know, so that's probably not right. But if you change it to something that is compatible with the predictions that can be made using quantum mechanics then that's most likely the truth.
Quantum mechanics may possibly be a case of observing determinism but we assume randomness by our current technology. Everything else observable has been fitting the deterministic modal. If a random variable were to be added to a person's mind as metaphorically similar to quantum mechanics, it would result in factoring into the future events of the person and similar to all the other variables & events a person experiences.
