Mean weight of 25 students of a class is 60 kg. If mean weight of first 13 students is 57 kg and that of last 13 students is 63 kg, then the weight of the 13th students is
60 kg
40 kg
30 kg
None of the above
A
None of the above
B
40 kg
C
60 kg
D
30 kg
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Solution
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The correct option is D None of the above Required weight =57×8−(64+42+29+39+80+52+55) =456−361=95kg
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