Two histograms display the same grouped data. Diagram A uses frequency density and unequal class widths. Diagram B uses frequency as bar height with the same unequal widths.
Explain why Diagram B can lead to incorrect comparisons and state the defining area-frequency relationship.
8 exam-style questions on CCEA A Level Maths 2.5.1 Data presentation and interpretation. Each one has a worked solution and a mark scheme showing where the marks go.