1. Histograms
Example
The table shows the weights of employees in a factory.
Draw a histogram to represent these results.
Weight (kg)
Frequency
40 – 70 3
70 – 75 8
75 – 80 17
80 – 90 32
90 – 100 25
100 – 120 9

2. 1 2 3 4 5 20 40 60 80
100
120
Weight

3. a) Copy the table. Complete the frequency densities.
Example
The students from San Dimas High School took part in a “fun-run” for charity. The table shows the time the students took.
Time (mins)
40≤ t<60
60 ≤ t<70
70 ≤ t<80
80 ≤ t<90
90 ≤ t<100
100≤t<120
No of students 28 43 58 40 34 18
Frequency density
1.4
a) Copy the table. Complete the frequency densities.
b) Draw a histogram to illustrate this data

4. 1 2 3 4 5 6 20 40 60 80
100
120
Time

5. Example
The following table gives the heights of 80 children.
Draw a histogram to represent this information.
Height (cm)
Frequency
130 – 135 5
135 – 140 7
140 – 150 15
150 – 160 29
160 – 165 13
165 – 170 10
170 – 175 1

6. 1 2 3
120
140
160
180
Height
freq. Density