The universe by definition is indeterminate. Redewenur's example of radioactivity being a class proof.

What we see at the macroscopic level is the result of averaging.

The chaos at the quantum level averages out in such a manner that macroscopic things become predictable.

Here's an example to illustrate it.

The traffic pattern in the morning commute is always different. Different cars leave their houses at different times taking different routes (lanes, speeds, different accidents, etc.) to go from home to work. Yet the macroscopic affect is predictable.

DA Morgan