The weekly wages (in ?) of 30 workers in a factory are :

The weekly wages (in ?) of 30 workers in a factory are :
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.
Using tally marks make a frequency table with intervals as 800-810, 810-820 and so on.

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