Application of Number
Level 2
HOME
Pie Charts - Tutorial 3
So far we have looked at basic pie charts that have been split into halves, quarters and eighths. Pie charts are rarely that straight forward.
In this tutorial we will look at pie charts where the fractions are not easy.
| Example 3 |
The pie chart below shows the GNVQ exam results for a school. This time the fractions are not straight forward. The percentages have been added to help us.
As you can see, 60% gained a Merit. If the
total number of students were 100, then 60 of them would have a Merit. If there were 40
students, then
60% of 40 = 24 students.
If you cannot remember how to work out the percentage of an amount, click here to go to a tutorial about percentages.
The table gives some examples. Work through them to make sure that you understand how they work.
| Total
number of students |
Level | Working | Working | Number actually in that segment |
| 80 | Pass (15%) | 15% of 80 | 0.15 x 80 | 12 |
| 90 | Distinction (20%) | 20% of 90 | 0.20 x 90 | 18 |
| 40 | Fail (5%) | 5% of 40 | 0.05 x 40 | 2 |
| 40 | Pass (15%) | 15% of 40 | 0.15 x 40 | 6 |
| 40 | Merit (60%) | 60% of 40 | 0.60 x 40 | 24 |
| 40 | Distinction (20%) | 20% of 40 | 0.20 x 40 | 8 |
So we need to know the total number of the students or the thing that was used. Once we have that, we need to know the percentage of each segment. We can then work out how many are in each section.
| Example 4 |
Look at this animation. This example works out how much money each film made.
To practise working with basic pie charts try this assessment.
Or click below to go back to the main menu.
