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The number of people with different age groups visiting the exhibition is given below:
| Age | Number of people |
| Less than 10 | 10 |
| Less than 20 | 31 |
| Less than 30 | 68 |
| Less than 40 | 85 |
| Less than 50 | 102 |
1. The median class is
2. The modal class is
3. The mean of the upper limits of the modal and median class is .
4. The sum of the lower limits of the median and modal class is .
5. The abscissa of the point of intersection of the less than type and of the more than type cumulative frequency curves of a grouped data gives its .
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