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 then Rs, 850?


Class interval



Frequency



800 – 810



4



810 – 820



2



820 – 830



1



830 – 840



11



840 – 850



2



850 – 860



2



860 – 870



2



870 – 880



1



880 – 890



4



890-900



1



(i) Group have maximum workers = ( 830 – 840 )


(ii) Workers have earning more than Rs.850 = 2+1+4+1+2 = 10


(iii) Worker earns less than Rs.850 = 4+2+1+11+2 = 20.


Histogram: by drawing class interval on ‘x’ axis and number of workers on ‘y’ axis.



12