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The number of students in two classes A and B and the respective 'mean' of the marks obtained by each of the class are given in the following table : Class A Class B Number of Students 20 80 Arithmatic Mean 10 20 The combined 'mean' of the marks of the two classes will be :

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The number of students in two classes A and B and the respective 'mean' of the marks obtained by each of the class are given in the following table : Class A Class B Number of Students 20 80 Arithmatic Mean 10 20 The combined 'mean' of the marks of the two classes will be :






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