If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
A.53.33
B.54.68
C.55
D.None of these
Answer:B
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 55, 60, then the average marks of all the students is:
A.53.33 B.54.68 C.55 D.None of these