Pie charts
A pie chart is a circular chart. It shows the proportion of each group at a glance. Remember that there are 360° in a circle so each group in the pie chart will be a proportion of 360°.
A survey of the number of people in 180 vehicles is taken.
The results are in the table below.
| Number of people in a vehicle | Frequency |
| 1 | 120 |
| 2 | 40 |
| 3 | 13 |
| 4 | 5 |
| 5 or more | 2 |
| Total | 180 |
| Number of people in a vehicle | 1 |
|---|---|
| Frequency | 120 |
| Number of people in a vehicle | 2 |
|---|---|
| Frequency | 40 |
| Number of people in a vehicle | 3 |
|---|---|
| Frequency | 13 |
| Number of people in a vehicle | 4 |
|---|---|
| Frequency | 5 |
| Number of people in a vehicle | 5 or more |
|---|---|
| Frequency | 2 |
| Number of people in a vehicle | Total |
|---|---|
| Frequency | 180 |
To draw a pie chart for this data, find the proportion of 360.
| Number of people in vehicle | Frequency | Calculation | Angle |
| 1 person | 120 | \(\frac{120}{180} \times 360°\) | 240° |
| 2 people | 40 | \(\frac{40}{180} \times 360°\) | 80° |
| 3 people | 13 | \(\frac{13}{180} \times 360°\) | 26° |
| 4 people | 5 | \(\frac{5}{180} \times 360°\) | 10° |
| 5 or more | 2 | \(\frac{2}{180} \times 360°\) | 4° |
| Total | 180 |
| Number of people in vehicle | 1 person |
|---|---|
| Frequency | 120 |
| Calculation | \(\frac{120}{180} \times 360°\) |
| Angle | 240° |
| Number of people in vehicle | 2 people |
|---|---|
| Frequency | 40 |
| Calculation | \(\frac{40}{180} \times 360°\) |
| Angle | 80° |
| Number of people in vehicle | 3 people |
|---|---|
| Frequency | 13 |
| Calculation | \(\frac{13}{180} \times 360°\) |
| Angle | 26° |
| Number of people in vehicle | 4 people |
|---|---|
| Frequency | 5 |
| Calculation | \(\frac{5}{180} \times 360°\) |
| Angle | 10° |
| Number of people in vehicle | 5 or more |
|---|---|
| Frequency | 2 |
| Calculation | \(\frac{2}{180} \times 360°\) |
| Angle | 4° |
| Number of people in vehicle | Total |
|---|---|
| Frequency | 180 |
| Calculation | |
| Angle |
