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  • 22-03-2024
  • Mathematics
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A sample of 40 bus drivers employed by public corporations was selected, and the number of traffic accidents in which each bus driver was involved during a 10-year period was determined.
| Number of accident | Frequency |
| 0-5 | 10 |
| 6-11 | ? |
| 12-17 | 15 |
| 18-22 | 5 |

The sample size is

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