The number of children of various age groups playing in the park.
| Age | \(2 - 4\) | \(4 - 6\) | \(6 - 8\) | \(8 - 10\) | \(10 - 12\) |
| Number of children | 3 | 7 | 9 | 13 | 19 |
Find its standard deviation using step deviation method.
Answer:
The standard deviation of the data is .