SFR Lesson Notes The Winston Churchill School
Histograms  Handling Data
1.6
1.4
age
frequency
frequency density
0 x < 20
21
1.05
20 x < 40
15
0.75
40 x < 100
34
0.57
1.2
frequency density
1.0
0.8
0.6
0.4
0.2
0
20
40
60
80
100
age
1
age
frequency
class width
frequency density
0 x < 20
21
20
21 / 20 = 1.05
20 x < 40
15
20
15 / 20 = 0.75
40 x < 100
34
60
34 / 60 = 0.57
frequency density =
frequency
class width
Draw a histogram for this data
2
3
How many people were included in this survey?
4
5