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Answer :
A grouped frequency table of class size 0.5 has to be constructed, starting from class
interval 2 - 2.5.
Therefore, the class intervals Will be 2 - 2.5, 2.5 - 3, 3 - 3.5...
By observing the data given above, the required grouped frequency distribution table can be
constructed as follows.
Lives of batteries (in hours) | Number of Batteries |
2 - 2.5 | 2 |
2.5 - 3 | 6 |
3 - 3.5 | 14 |
3.5 - 4 | 11 |
4 - 4.5 | 4 |
4.5 - 5 | 3 |
Total | 40 |