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Home > Maths II > Relationships > Pie charts and frequency diagrams

Maths II

Pie charts and frequency diagrams

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Once you have collected your raw data, you need to represent it in a diagram. Two ways of doing this are to use a pie chart or frequency diagram.

Pie charts and frequency diagrams

 

In a survey, 100 school students were asked to name their favourite soap. The results are shown in a pie chart and a frequency diagram below.

Two grapsh showing the same data, about the number of pupils who watch Eastenders, Emmerdale and any other soaps. The pie chart shows 180 degrees for Eastenders, 60 degrees for emmerdale and 120 degrees for other. The bar graph shows the same data but you can see the actual number watching eastenders is 50.

In another school, Emmerdale was the most popular soap:

Two graphs showing the same data, about which soaps are watched by how many pupils. The pie chart shows 270 degrees watch emmerdale, 54 degrees watch eastenders, and 36 degrees watch others. The bar chart shows the actual figure for emmerdale viewers is over 75. The other two bars beside it are much lower.

Remember: the larger the number, the larger the angle in the pie chart.

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