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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 4 sections. Determine overall average of marks per 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 4 sections. Determine overall average of marks per student.

The mean of 5 observations is 60, the mean of 10 observations is 30 and the mean of 15 observations is 20. The mean of all the 30 observations is-

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.

Averages Aptitude Questions

Arithmetic-Aptitude