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Answer :
i) our class interval will be 0 - 5 , 5 - 10 , 10 - 15 .....
The group distribution frequency table can be constructed as follows.
Hours | No. of children(frequency) |
0 - 5 | 10 |
5 - 10 | 13 |
10 - 15 | 5 |
15 - 20 | 2 |
Total | 30 |