The best we can do is to use the mathematics of quantum physics to say how likely, how probable, it is that we’re currently in a particular branch of the wave function—which means we’re assigning a probability to seeing a particular outcome of the experiment when we do look. So probability is still an essential part of quantum physics in the many-worlds interpretation; it’s just that the probability isn’t, strictly speaking, about outcomes of experiments, but rather about where you find yourself in the universe right now.
Hmm
