Pie Charts
A pie chart can be used to represent all types of variables, but is more commonly used for categorical variables.
The data is represented in a circle and the angle of each circular sector is proportional to the corresponding absolute frequency.
The pie chart can be constructed with the help of a protractor.
Example
In a class of 30 students, 12 play basketball, 3 swim, 9 play football and the rest do not practice any sport.
| Students | Angle | |
|---|---|---|
| Basketball | 12 | 144° |
| Swimming | 3 | 36° |
| Football | 9 | 108° |
| No sport | 6 | 72° |
| Total | 30 | 360° |
