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Calculate the class interval of the required class.
Class | \(1\) | \(2\) | \(3\) | \(4\) | \(5\) |
Interval | 6.5 - 12.5 | 12.5 - 21.1 | 21.1 - 38.3 | 38.3 - 44.5 | 44.5 - 54 |
The class interval of class \(4\) is .
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