Interpreting pie charts
I can interpret pie charts.
Interpreting pie charts
I can interpret pie charts.
Lesson details
Key learning points
- Knowing the angle size for a sector allows calculation of the frequency.
- By knowing the total, statements can be made comparing the data.
- Different pie charts may have different totals even though proportions are the same.
Keywords
Pie chart - A pie chart (pie graph) is a circular graph where sectors represent different groups proportionally.
Frequency - The frequency is the number of times an event occurs; or the number of individuals (people, animals etc.) with some specific property.
Sector - A sector is the region formed between two radii and their connecting arc.
Proportion - Proportion is a part to whole (sometimes part to part) comparison. If two things are proportional, the ratio of part to whole is maintained
Degrees - Degrees are the most common unit of measurement for angle. One whole turn is equal to 360 degrees, written 360°.
Common misconception
Two sectors on two different pie charts that have the same angle represent the same frequency.
90° of a pie chart of 4 data points represents less frequency (frequency of 1) than 90° of a pie chart of 200 data points (frequency of 50).
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Lesson video
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Starter quiz
6 Questions
a -
120
b -
360
c -
3
d -
54
e -
132
Exit quiz
6 Questions
a -
4
b -
128
c -
72
d -
18
e -
90