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A school has 4 sections of Chemistry in class X having 40, 35, 45 and 42 students.

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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. 

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Hence, the overall average marks of per student is 52.25

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