Distances, recorded to the nearest mile, have frequencies 4, 19, 41, 26 and 9 in the classes 0–9, 10–14, 15–18, 19–20 and 21–25. On a printed histogram, the 10–14 bar is 3 cm wide and 1.9 cm high.
Find the printed width and height of the 15–18 bar.
Find the printed width and height of the 19–20 bar.
8 exam-style questions on OCR (MEI) A Level Maths 2.2.2 Area in a histogram is proportional to frequency. Each one has a worked solution and a mark scheme showing where the marks go.