A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 student

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A school has 4 sections of chemistry in Class X having 40, 35, 45 and 42 students. The mean marks obtained in Chemistry test are 50, 60, 55 and 45 respectively for the 4 sections. Determine the overall average of marks per student.

Options:

A . 50.25

B . 51.25

C . 52.25

D . 53.25

Answer: Option C

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