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Charts and diagrams
Charts make data easy to compare. Each type suits a different kind of data.
Common charts
Pie charts
Angle for a category = frequencytotal × 360°.
12 out of 40 people: 1240 × 360 = 108°.
12 out of 40 people: 1240 × 360 = 108°.
Stem and leaf
The stem is the tens and the leaf is the units: 3 | 4 7 means 34 and 37.
Always include a key. It makes the median and range easy to find.
Always include a key. It makes the median and range easy to find.
In a survey of 60 people, 15 chose tea. Find the pie chart angle for tea.
- 1560 × 360
Answer: 90°
Choose the chart for the job. Pie chart angle = frequency ÷ total × 360°. Stem and leaf diagrams need a key and keep every value.
The interactive lesson includes the diagrams for this topic.
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