Print

Maths

Pie charts and frequency diagrams

Page:

1. Back
2. Next

# Interpreting pie charts and frequency diagrams

## Example

The pie chart below shows the heights (in cm) of 30 pupils in a class.

The biggest slice of the pie chart contains the most people - 151-160cm.

Question

How many pupils are between 121-130cm tall?

The angle of this section is 36 degrees. The question says there are 30 pupils in the class. So the number of pupils of height 121 - 130 cm is:

36/360 x 30 = 3

## Example

A survey was conducted to determine the number of people in cars during rush hour. The results are shown in the frequency diagram below.

Question

What is total number of cars in the survey?

6 + 3 + 5 + 1 = 15

There are 6 cars with one person in, 3 cars with two people, 5 cars with three people, and 1 car with four people.

Question

What is the most likely number of people in a car?

1.

Cars in the survey are most likely to have 1 person in them as this is the tallest bar - 6 of the cars in the survey had one occupant.

Page:

1. Back
2. Next

Back to Statistics and probability index

BBC iD