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FM Two-way Frequency Table

1.2 Displaying Distributions of Categorical Data

Visualising Categorical Data


  • The number of times a particular value or category occurs is known as the frequency. This is often used as the basis for displaying and analysing categorical data.


In the following dataset of colours:

Red Red Blue Red

The frequency of each colour is:

Red: 3

Blue: 1


  • The proportion of the total data points which belong to a particular group is known as the percentage.
  • This can be calculated using the formula:
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