>>42
We can't determine something specific in practice, such as the cat being alive or dead, but we can enounce laws of Physics which govern the cat and decide whether he's dead or not. Again, the fact we can't determine one particular variable in a real case doesn't mean we should call it a non-deterministic system.
This reminds me of electron clouds: the electron cloud is not the electron itself! Regardless of if we talk of electron clouds because we don't know where each is, and it's more useful to know where it's probable to be found, the electron exists and it's in one point.