Brainlag PlusBar charts, pie charts, stem-and-leaf diagrams, frequency polygons and time series, and how a chart can mislead.
Pie charts share out 360°
Each item in a pie chart gets 360 ÷ total degrees.
With 40 people, each person gets 360 ÷ 40 = 9°, so a group of 12 gets 12 × 9 = 108°. To read a pie chart backwards, find the fraction of the circle: a 72° sector out of 90 people is 72/360 × 90 = 18 people.
A bigger sector is a bigger fraction, not always a bigger number: two pie charts with different totals cannot be compared by angle alone.
The rest of this lesson and its 8 practice questions are in Plus.
Screen 1 of 4, free to read.
- 8 exam-style questions, marked as you go, each with a worked solution
- Anything you get wrong is saved to your flashcards