if the average marks of three batches of 55, 60 and 45 students respectively is 50 ,55 and 60 then the average mark of all the student is
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Total students = 55 + 60 + 45 = 160
Total marks of first batch = 55 x 50 = 2750
Total marks of second batch = 60 x 55 = 3300
Total marks of third batch = 45 x 60 = 2700
Total marks = 2750 + 3300 + 2700 = 8750
Average = 8750/160 = 54.69
Hope it helps :)
Pls mark as brainliest :)
Total marks of first batch = 55 x 50 = 2750
Total marks of second batch = 60 x 55 = 3300
Total marks of third batch = 45 x 60 = 2700
Total marks = 2750 + 3300 + 2700 = 8750
Average = 8750/160 = 54.69
Hope it helps :)
Pls mark as brainliest :)
Answered by
2
54.68
step-by-step explanation:
sum of marks of 1st student 's batch=50×55
sum of marks of 2nd student 's batch=60×55
sum of marks of 3rd student 's batch=60×45
avg. marks of all students =sum of marks of all students /no. of students avg.
=(60*55 60*45 50*45)/(55 60 45) thus avg.
=54.68
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