Tables and charts
Objective. Construct and interpret frequency tables and bar charts.
- 1. Learn
- 2. Worked example
- 3. Practice
- 4. Feedback
- 5. Continue
Learn: the key idea
Tables and charts organise collected data so that patterns and comparisons become easier to see at a glance. A frequency table records how often each value or category occurs, usually built up from a tally chart. A bar chart displays categorical data using separate bars of equal width, with height representing frequency, while a pie chart shows how a total is divided into proportional sectors. Choosing the right chart depends on the type of data: bar charts suit distinct categories, while pie charts best show parts of a whole.
Worked example
A frequency table shows favourite pets: Dog 12, Cat 8, Fish 5, Rabbit 5. If this data were drawn in a pie chart, find the angle representing 'Dog'.
- 1Find the total number of responses: 12+8+5+5=30.
- 2Find the fraction representing Dog: 12/30.
- 3Multiply this fraction by 360° to find the angle: 12/30×360.
- 4Calculate the result: 12×360÷30=144.
Answer: 144°
Concept mastery
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Practice
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Start practisingCommon mistake. Pupils sometimes draw bar chart bars touching each other as if the data were continuous, when it represents separate categories. Always leave gaps between bars for categorical data.
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