The average weight of 40 students in a class is 55 kg.six students of them whose average weight is 52 kg leave the claß and another six students whose average weight is 42 joins the class. what is the new average of the class?
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Sum of the weight of 40 students = 55*40= 2200
Difference in ages due to new 6 students
52*6-42*6 = 60
New average 2200-60/40 = 2140/40 = 53.5
Difference in ages due to new 6 students
52*6-42*6 = 60
New average 2200-60/40 = 2140/40 = 53.5
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