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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:



First batch --- no. Of students is 55. Avg=50 total marks =55*50=2750 Second batch -no.of students-60.Avg=55. Total marks=60*55=3300 Third batch--no.of students-45.Avg=60 Total marks=45*60=2700 Total marks of students-- 2700+3300+2750=8750 total no. of students_-55+60+45 =160 Avg=8750/160=54.68
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