The mean weight of 35 students of a class is 32 kg. What will be their mean weight after
a year if each of them gains a weight of 1.25 kg?
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Answer:
total weight=average weight×no. of students
=32×35
=1120kg
gained weight=1.25×35
=43.75
New weight=1120+43.75
=1163.75
new average weight=new weight/ no.of students
1163.75/35=33.2kg
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