Histograms: GCSE Maths revision
In a histogram, the <strong>area</strong> of each bar is the frequency. Frequency density = frequency ÷ class width. Unequal widths are the whole point.
Formula
Try these questions
Cover the answers and have a go first. Worked solutions are underneath.
Frequency 20, class width 5. Frequency density?
FD = 6, width = 2. Frequency?
Common mistakes
- Drawing bar heights as frequency when class widths are unequal.
Answers and working
Frequently asked questions
Can a histogram have gaps?
Not for continuous data. Bars should touch. Gaps mean you are drawing a bar chart of categories.
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