If the average marks of three batches of 65, 60 and 45 students respectively is 50, 55 and 60, then ...
If the average marks of three batches of 65, 60 and 45 students respectively is 50, 55 and 60, then the average marks of all the students is
Answer/Solution
54.41
Steps/Work
Sol.
Required average = [65x50 + 60x55 + 45x60 / 65 + 60 + 45]
= [3250 + 3300 + 2700 / 160]
=9250 / 170 = 54.41.
Answer B
Required average = [65x50 + 60x55 + 45x60 / 65 + 60 + 45]
= [3250 + 3300 + 2700 / 160]
=9250 / 170 = 54.41.
Answer B