A standalone interactive lesson page for Rize's Statistics course (catalog code MATHS VIII). No login and no backend; progress is saved in the browser's own localStorage.
Live: https://rizecomputerscience.github.io/maths8-what-averaging-does/
Source: projects/coursedev/MATHS-VIII/interactive/pages/what-averaging-does/ on Samuel's machine (SPEC.md the spec and build notes, src/ the source, build.py the build). index.html here is the built page, unchanged. It defines window.__selfCheck() for Rize's page-health monitor (swachtel-dev/rize-interactive-health).