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Find mean by assumed mean method.
| Class interval | \(10-25\) | \(25-40\) | \(40-55\) | \(55-70\) | \(70-85\) | \(85-100\) |
| Number of students | \(2\) | \(3\) | \(7\) | \(6\) | \(6\) | \(6\) |
The mean of the data is .
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