The mean weights of three groups of students are 40kg, 45kg and 50kg respectively. if the number of students in the group are 45, 30 and 25 respectively, what is the mean weight of all the students?
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5 in order to bring the average up to 40.5
Alternatively we can set up an equation where S is the sum of all the students weights (35x40 )...
Hope it helps u..
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