If the average marks of three batches of 55, 60 and 45 students respectively is 50, 84, 60, then the average marks of all the students is
Choose the correct choice from the following options
A) 54.48 B) 54.68 C) 54.6 D) 54.58 E) 65.56
65.56xplanation:   (55Ã—50)+(60Ã—84)+(45Ã—60) / 55+60+45   10490 / 160=65.56   Option 65.56
<result>E</result>
If the average marks of three batches of 55, 60 and 45 students respectively is 50, 84, 60, then the average marks of all the students is