Cumulative Frequency

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Cumulative Frequency

• How to draw a cumulative frequency graph

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Draw a cumulative frequency diagram for this data
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Create a third CUMULATIVE FREQUENCY column like
this
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You dont have to show working
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You dont have to show working
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Plot the second number in the data column against
the number in the cumulative frequency column
Plot these numbers
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Now, join up the points
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You can use this to find the middle half
¾ (18)
½ (12)
Upper Q (53)
¼ (6)
Median (42)
Lower Q (30)
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The Lower Quartile is 30 Median is 42 The Upper
Quartile is 53 This means that the middle half
is between 30 and 53. Called the inter-quartile
range.53 30 23