Author note — to cover

State the modal class of grouped data as the interval with the highest frequency, written in correct inequality notation, for equal-width classes. Stress the answer is a class, not a value. Unequal widths where density decides the true modal class are Higher territory, flagged here but taught on the histogram pages. Both tiers. (S4)

• Fluency — direct questions on the modal class, 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).