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GCSE Maths

Statistics

Cumulative Frequency

Cumulative Frequency

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Level 7–8
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Key Points 

  • Plot the cumulative frequency against the upper class boundary.

  • Join the points with a smooth curve.

  • Used to estimate the median, quartiles and percentiles.

  • The interquartile range is Q3 − Q1.

  • Can be used to compare distributions.


Keywords: cumulative frequency, median, quartiles, percentiles, cumulative frequency graph, GCSE statistics.

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