In a class of 50 students, the mean marks obtained in a subject is 60 and in another class of 25 students the mean marks obtained in the same subject is 90. The mean marks obtained by the students of two classes taken together is:
Explanation:
The mean marks of the combined class of 75 students = 50×60+25×9050+25 = 525075 = 70.
Hence, option (c).
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