Question

4. A school has 4 sections in class XI having 45, 42, 35 and 40 students. The mean marks
obtained by the students of the four sections in a Mathematics test were 55, 45, 60 and
50 respectively. What was the overall average of the marks per student?
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Answer 1

Answer:

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