Currently Secure · last touched 2026-09-11
| When | Change | Evidence | Session |
|---|---|---|---|
| 2026-09-11 | Secure → Secure | 11 Sep starter: P(both red) without replacement, 42/90 → 7/15, simplified unprompted on the hardest question of the starter. The simplifying step that was missing on 8 and 9 Sep and on the drawn tree of 10 Sep. | session 19 |
| 2026-09-10 | Developing → Secure | Tree diagrams taught 9 Sep, both with and without replacement. Exit ticket 5/5 fully independent: correct tree for 4 mint and 6 toffee without replacement, all six branch probabilities right, then both-mints, both-toffees and one-of-each all correct with the sum-to-1 check applied unprompted. Sample spaces and Venn probabilities already evidenced independently on 8 Sep. This ref is now complete — all three parts taught and evidenced. | session 17 |
| 2026-09-08 | Developing → Developing | 8 Sep: Venn probabilities off the class of 30, 4/4 independent and all simplified, including P(French) = 18/30 = 3/5 rather than 12/30 — the whole-circle trap named on 7 Sep and cleared here. Two-coin sample space correct in the starter. | session 11 |
| 2026-09-07 | Gap → Developing | Taught 7 Sep. Two-dice sample space: 36 outcomes, 6 ways to total 7, probability correct (given as 0.167, prompted to leave it exact). Venn built correctly for the class of 30: 12 French only, 6 both, 8 German only, 4 neither, regions checked against the total. Drawn rather than listed. | session 7 |
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