Admittedly beyond at the limits of what this armchair quantum mechanic can say with confidence but to borrow from Hawkings... probabilities in quantum mechanic

Admittedly beyond at the limits of what this armchair quantum mechanic can say with confidence but to borrow from Hawkings... probabilities in quantum mechanics "reflect a fundamental randomness in nature" [The Grand Design]. So while quantum theories are testable, they are not always predictive (necessary for determinism).