Lessons rebuilt as study pages — the explanation, the worked numbers, the traps and
a practice set. Organised by subject, newest first. Each page carries the date it was taught and
where.
Spread, box plots and cumulative frequency curves
Mean vs median with an outlier · standard deviation two ways · reading all five
box-plot values · cumulative frequency rules and the "more than" flip · the two-sentence
comparison answer
Sat 29 Aug 2026·Indigo — tuition
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