Quantum Mechanical Randomness and Probability in Real Physics

In practice, they could test this prediction by doing the experiment many times. Every formula purporting to predict the sequence of outcomes will eventually fail. In the overwhelming majority of universes and histories, the search will happen approximately half the time. Only a tiny proportion of the instances of the observers will see anything different. And against classical rivals, a case of classical physic says the same thing can happen over and over again.