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Question
The cumulative frequency of the class 70 - 90 is:
Options
80
120
180
40
MCQ
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Solution
120
Explanation:
From the graph, we form the cumulative frequency table:
| Class | Frequency | Cumulative frequency |
| 30-50 | 50 | 50 |
| 50-70 | 30 | 80 (50 + 30) |
| 70-90 | 40 | 120 (80 + 40) |
| 90-110 | 60 | 180 (120 + 60) |
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