A school has 4 section of Chemistry in Class X having 50…

A school has 4 section of Chemistry in Class X having 50, 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.

This problem repeats another one in the library (at most with different numbers), so it's left out of browsing.

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