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Question

A school has four sections of chemistry in class XII having 40, 35, 45 and 42 students. The mean marks obtained in chemistry tests are 50, 60, 55 and 45 respectively for the four sections. The overall average of marks per students is:


A
53
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B
45
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C
55.3
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D
52.25
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Solution

The correct option is C 52.25
Total number of students =40+35+45+42=162
Total marks obtained
=(40×50)+(35×60)+(45×55)+(42×45) 
=8465
Overall average of marks =8465162=52.25

Mathematics

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