It's deterministic in the sense that QM gives you an exact answer about what happens at the quantum scale for any interaction, without any probability involved.

It's deterministic in the sense that QM gives you an exact answer about what happens at the quantum scale for any interaction, without any probability involved. However, the exact values that QM predicts are not real numbers for speed etc, they are a complex numbers describing a wave, with different values for different positions in space-time. These numbers precisely describe how the wave-packet will interact with other wave-packets. But, if you want to do a classical measurement, then the only known relationship between the wave description and the outcome of your experiment is the Born rule - the amplitude of the wave at a point X in space-time is proportional to the probability that the particle will be detected at that point.