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