If the average marks of three batches of 55, 60 and 45 students respec – McqOptions

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1.	If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, what is the average marks of all the students?
A.	55.77
B.	56
C.	54.68
D.	54
Answer» D. 54

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