the mean of marks secured by 60 students in division A of class X is 64, 40 students of division B is 60 and that of 60 students of division C is 58. find the mean of marksbof the students of three divisions of class X.
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As I think the answer is 60+64+58/?3 =182/3 =60.66...
Altmile:
and divide them with the number of students in total
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the amount of marks scored (in total) divided by
total no of students
= 3840 + 2400 + 3480
----------------------------------
60 + 40 + 60
=60.75
total no of students
= 3840 + 2400 + 3480
----------------------------------
60 + 40 + 60
=60.75
3840 .kese aaya
multiply the no. of students with the avg marks of the class
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