Author note — to cover

Relative frequency as frequency over total trials, simplified, and also as a decimal or percentage; computed from a results table and used as a probability estimate; include running recalculation as further batches arrive. Both tiers. Exclude fairness verdicts and sample-size judgements, which live in the bias-and-sample-size group. (P1, P3)

• Fluency — direct questions on relative frequency, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).