If the average marks of three batches of 45, 68 and 55 students respectively is 50, 55, 60, then the average marks of all the students is	Choose the correct choice from the following choices:
A) 55.29
B) 54.68
C) 54.6
D) 54.58
E) None of these
Explanation:   (45Ã—50)+(68Ã—55)+(55Ã—60) / 45+68+55   9290 / 168=55.29   Option 55.29
<result>A</result>
If the average marks of three batches of 45, 68 and 55 students respectively is 50, 55, 60, then the average marks of all the students is