16 Cumulative Frequency Worksheet Page 10
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27MEP Y9 Practice Book B
5.
The bar chart shows the results of a survey into the height of 14-year-old
pupils.
Frequency
90
85
80
75
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
140
150
160
170
180
190
Height (cm)
(a)
State the modal class.
(b)
Calculate an estimate of the mean height.
6.
The heights of some plants grown in a laboratory were recorded after 4
weeks. The results are listed in the following table:
Height (cm)
11 - 15
16 - 20
21 - 25
26 - 30
31 - 35
36 - 40
Frequency
3
7
19
20
11
2
(a)
Draw a frequency polygon for the data.
(b)
State the modal class.
(c)
Calculate an estimate of the mean height.
177
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