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Answer variants:
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Determine the value of "\(a\)" if the mean of the following data is 15.
| Class interval | \(5 - 10\) | \(10 - 15\) | \(15 - 20\) | \(20 - 25\) | \(25 - 30\) | \(30 - 35\) |
| Frequency | 8 | 9 | 4 | \(a\) | 2 | 1 |
The value of the variable is .
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