IGCSE Math RevisionExam tip poster: Histograms: area is frequency (IGCSE Maths 4MA1 Higher)
A4 portrait. It is drawn in vector form, so it also prints sharply scaled up to A3.
The poster
The maths
A common mistake the examiners point out: Histograms: reading heights as frequencies. What to do instead: Frequency = frequency density × class width. Use a bar you know to work out the scale.