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Calculate the class interval of the required class.
Class | \(1\) | \(2\) | \(3\) | \(4\) | \(5\) |
Interval | 9.1 - 12.2 | 12.2 - 25.6 | 25.6 - 33.8 | 33.8 - 49.9 | 49.9 - 57.8 |
The class interval of class \(1\) is .
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