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GCSE Statistics · key term
A running total of frequencies up to a particular value or class boundary.
Used by Edexcel
Specification 2a.03, 2b.01, 2c.01 · Paper 1, Paper 2
A running total of frequencies up to a stated value or boundary.
Revise: Graphical data representationOther graphs require calculated values, such as percentages, class midpoints, cumulative frequencies or quartiles.
Use class midpoints for frequency polygons and upper class boundaries for grouped cumulative frequency graphs.
For discrete cumulative frequency, use steps: jump at each possible value and stay horizontal between values. For grouped data, join upper-boundary points with straight lines or a smooth curve.
For grouped median interpolation, use n/2, the cumulative frequency before the median class and that class’s own width.
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The running total of frequencies up to a particular value or class boundary.