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GCSE Statistics · key term
The difference between a class's upper and lower boundaries: .
Used by Edexcel
Specification 1b.02, 2a.04, 2a.06 · Paper 1, Paper 2
The upper class boundary minus the lower class boundary, measured in the units of the variable.
The difference between the upper and lower boundaries of a class interval.
Calculate class width from the boundaries, not by subtracting the first and last whole-number values included.
Calculate each class width from its boundaries, then show frequency ÷ class width before drawing the bar.
For unequal class widths, label the vertical axis ‘Frequency density’, or give a clear proportional key. Do not label unscaled bar heights ‘Frequency’.
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