if the average marks obtained by the students of section A and B of class 11th in school are 40 and 30 respectively. Whereas the number of students in section A and B are 60 and 40 . find out the combined mean
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60(40) + 40(30)
_________________
60 + 40
= 2400 + 1200
________________
100
= 3600
_________
100
= 36
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