Cumulative Frequency Flashcards

GCSE Mathematics (Edexcel) 1MA1

Cumulative Frequency

The running total of frequencies as you move through a data set.

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Terms in this set (10)

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Cumulative Frequency

The running total of frequencies as you move through a data set.

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Cumulative Frequency Table

A table that shows the cumulative frequency for each class interval in a data set.

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How to calculate cumulative frequency

Add each frequency to the total of the frequencies before it.

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Cumulative Frequency Graph

A graph that plots cumulative frequency against the upper boundary of each class interval.

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Purpose of a Cumulative Frequency Graph

To estimate medians, quartiles, and percentiles of a data set.

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Median from a Cumulative Frequency Graph

The value corresponding to the middle cumulative frequency (n/2) on the graph.

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Lower Quartile (Q1)

The value corresponding to 1/4 of the total cumulative frequency (n/4) on the graph.

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Upper Quartile (Q3)

The value corresponding to 3/4 of the total cumulative frequency (3n/4) on the graph.

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Interquartile Range (IQR)

The difference between the upper quartile (Q3) and the lower quartile (Q1).

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Key feature of a cumulative frequency graph

The graph is always a smooth curve or a series of connected points that never decreases.

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