2. Read and interpret data from a pie chart.
Example 1 :
Number of books read by four girls in a week.
Pie Chart =
10% 100%
Susan
40%
30% Ah Ling
Aini
Tan
The total number of books read by four girls is 30.
a) What is the number of books read by Ah Ling ? (maximum)
Step 1 :
40 Interpret the data
40% =
100
Step 2 :
4
10
x 30 = 12 books
b) What is the number of books read by Susan? (minimum)
Step 1 :
30
10% =
100
Step 2 :
3
10
x 10 = 3 books
c) Find the difference number of books between Ah Ling and Susan. (range)
Step 1:
12 books – 3 books = 6 books
d) Find the average books read by Ah Ling, Aini and Susan
Ah Ling = 12 books
Susan = 3 books
Aini : Average :
Step 1 :
30% =
30 12 + 3 + 9
100
3
Step 2 : = 24 ÷ 3
3
10
x 30 = 9 books
= 8 books
3. Example 2 :
Favourite games of 160 pupils.
20% 15%
Tennis Netball
25%
Hockey Football
a) How many pupils like football? (maximum)
Step 1 : Step 2 :
40 % = X 160 =
b) How many pupils like Netball ? (minimum)
Step 1 : Step 2 :
15 % = X 160 =
c) Find the difference number between pupils like Football and Netball. (range)
Step 1 :
Pupils + Football subtract by Netball
like =
d) Find the average of pupils of the four games?
Football = ? Netball = ?
Hockey : Tennis : Average :
Step 1 : Step 1 :
25% =
25
15% =
15 ?+?+?+?
100 100
4
Step 2 : Step 2 :
1 3 = ?
4
x 160 = ? 20
x 160 = ?
