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