The weekly wages (in Rs) 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.

Frequency distribution table using the tally marks for the given data is:


Interval



Tally marks



Frequency



800-810



III



3



810-820



II



2



820-830



I



1



830-840



IIIIIIII



9



840-850



IIII



5



850-860



I



1



860-870



III



3



870-880



I



1



880-890



I



1



8