The weekly wages (in rupees) of 30 workers in a factory are given below: 830, 835, 890, 810, 835, 836, 869, 845, 898, 890, 820, 860, 832, 833, 855, 845, 804, 808, 812, 840, 885, 835, 836, 878, 840, 868, 890, 806, 840, 890.
Represent the data in the form of a frequency distribution with class size 10.
Minimum observation = 800
Maximum observation = 900
∴ Range = 900 – 800 = 100
Class size = 10
Number of classes = 
Class | Frequency |
800 – 810 | 3 |
810 – 820 | 2 |
820 – 830 | 1 |
830 – 840 | 8 |
840 – 850 | 5 |
850 – 860 | 1 |
860 – 870 | 3 |
870 – 880 | 1 |
880 – 890 | 1 |
890 – 900 | 5 |
10