if the average marks of 3 batches of 55 , 60 and 45 students respectively is 40 , 62 , 58 , then the average marks of all the students is
Choose the correct choice from the following options:
A) 54.48
B) 53.31
C) 54.6
D) 54.58
E) none of these

Rationale: explanation : ( 55 ã — 40 ) + ( 60 ã — 62 ) + ( 45 ã — 58 ) / 55 + 60 + 45 8530 / 160 = 53.3 option b
Answer: B