3 marksStandard
The cumulative frequency graph for the times taken by 100 athletes to complete a race has the following points:
| Time (seconds) | Cumulative frequency |
|---|---|
| 10 | 15 |
| 20 | 60 |
| 30 | 75 |
| 40 | 100 |
Estimate the number of athletes who took more than 20 seconds.
- (a)[3]
Enter the number of athletes who took more than 20 seconds.
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