A school has 4 sections in class X having 45, 50, 42 and 30 students respectively. A
test in Mathematics was conducted in all the sections and the mean marks of these
sections are 62,55,58 and 49 respectively. Find the overall average mark of the class.
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⇒ For 1st section total marks obtain by class =40×50=2000
⇒ For 2nd section total marks obtain by class =35×60=2100
⇒ For 3rd section total marks obtain by class =45×55=2475
⇒ For 4th section total marks obtain by class =42×45=1890
⇒ The overall average of marks per students =
40+35+45+42
2000+2100+2475+1890
=
162
8465
=52.25
I hope it's helpful for you
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