challenge 1: mean, median, mode bonus challenge: weighted mean
Run ./scripts/test.sh to run your tests.
To rerun your tests as you make changes, run ./scripts/test.sh --watch.
All python files should format themselves using black on-save, and should be continually checked by mypy (for type checking) and flake8 (for other common python errors, such as a mistyped keyword argument).
If my configuration didn't stick, you can run any of those commands on the command line.