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Find the mean of the number of children of various age groups playing in the park using step deviation method.
| Age | \(2 - 4\) | \(4 - 6\) | \(6 - 8\) | \(8 - 10\) | \(10 - 12\) |
| Number of children | 8 | 7 | 7 | 3 | 4 |
The mean of the data is
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