In a data set with an odd number of observations, the median is the middle observation when the data is arranged in ascending order.
Given that there are 25 observations, the median will be the \( \left( \frac{25 + 1}{2} \right) \)-th observation, which is the 13th observation.
The correct option is (B): 13th
| Age Group | 0-2 | 2-4 | 4-6 | 6-8 | 8-10 |
| Number of children | 5 | 7 | 3 | 2 | 2 |