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In a survey conducted in a town, the number of children in the houses is given below:
| Families | Number of children |
| More than or equal to 400 | 10 |
| More than or equal to 800 | 6 |
| More than or equal to 1200 | 3 |
| More than or equal to 1600 | 1 |
| More than or equal to 2000 | 0 |
1. The lower limit of the median class is .
2. The upper limit of the median class is .
3. The median is .
4. The construction of cumulative distribution table is useful in determining the .
5. Which family group have the maximum number of children?
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