The average. sum ÷ count
The middle of the sorted list.
The most common value.
The spread. max − min
Phase 1 — Learn: 10 focused questions per measure (40 total). Clean integer answers, concept intro at the start of each section.
Phase 2 — Master: 160 mixed questions. Decimal means, even-count medians, no hints — all four measures at random.
| Measure | Phase | Score |
|---|