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प्रश्न
The weekly wages (in Rs.) of 30 workers in a factory are given:
830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 835, 836, 878, 840, 868, 890, 806, 840
Mark a frequency table with intervals as 800-810, 810-820 and so on, using tally marks. Also, draw a histogram and answer the following questions:
(i) Which group has the maximum number of workers?
(ii) How many workers earn Rs 850 and more?
(iii) How many workers earn less than Rs 850?
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उत्तर
The frequency table with intervals 800-820, 810-820,...890-900 is given below:
| Wage (in Rs) | Tally Wage | Frequency | Tally marks |
| 800-810 | 804, 808, 806 | 3 | III |
| 810-820 | 810, 812 | 2 | II |
| 820-830 | 820 | 1 | I |
| 830-840 | 830, 835, 835, 836, 832, 833, 835, 835, 836 | 9 | |
| 840-850 | 845, 845, 840, 840, 840 | 5 | |
| 850-860 | 855 | 1 | I |
| 860-870 | 869, 860, 868 | 3 | III |
| 870-880 | 878 | 1 | I |
| 880-890 | 885 | 1 | I |
| 890-900 | 890, 898, 890, 890 | 4 | IIII |
(ii) The number of workers who earn Rs 850 or more can be calculated from frequency table in the following manner: \[1 + 3 + 1 + 1 + 4 = 10\]
(iii) The number of workers who earn less than Rs 850 can be calculated from frequency table in the following manner: \[3 + 2 + 1 + 9 + 5 = 20\]
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