Author note — to cover (Higher)

Higher only. Recover frequencies from a drawn histogram via area: whole classes, part-classes such as values above a point inside a bar, and grand totals. Include the trap that the tallest bar need not hold the most data, and estimating counts in a given range. Completing a partly drawn histogram is the sibling page. (S3)

• Fluency — direct questions on interpreting a histogram, 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).