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The number of students in four classes A, B, C, D and their respective mean marks obtained by each of the class are given below: Class Class Class Class A B C D Number of students 10 40 30 20 Arithmetic mean 20 30 50 15 The combined mean of the marks of four classes together will be:

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The number of students in four classes A, B, C, D and their respective mean marks obtained by each of the class are given below: Class Class Class Class A B C D Number of students 10 40 30 20 Arithmetic mean 20 30 50 15 The combined mean of the marks of four classes together will be:






 
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