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Question
Construct a grouped frequency table from the following data of the daily wages earned by 60 labourers in a company. Take each class size as 7.
25, 26, 34, 48, 39, 16, 55, 28, 37, 42, 45, 55, 28, 54, 53, 18, 35, 47, 44, 28, 55, 45, 39, 54, 21, 49, 45, 38, 29, 53, 48, 44, 15, 28, 14, 32, 15, 44, 14, 15, 16, 41, 33, 52, 29, 34, 51, 22, 19, 37, 44, 25, 48, 38, 24, 52, 51, 42, 32, 27.
Solution
Minimum value of variate = 14
Maximum value of variate = 55
∴ Range
= 55 − 14
= 41
Class size = 7
∴ No. Of class intervals
= `(41)/(7)`
= 6
| Class | Tally Marks | Frequency |
| 14 - 21 | IIII IIII | 9 |
| 21 - 28 | IIII II | 7 |
| 28 - 35 | IIII IIII I | 11 |
| 35 - 42 | IIII III | 8 |
| 42 - 49 | IIII IIII III | 13 |
| 49 - 56 | IIII IIII II | 12 |
| Total | 60 |
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