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The mean weight of 21 students is 21 k...

The mean weight of 21 students is 21 kg. If a student weighing 21 kg is removed from the group, then the mean of the remaining students is
(a) 20 kg                               
(b) 21 kg
(c) 19 kg                               
(d) 18 kg

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RD SHARMA ENGLISH-DATA HANDLING 2-All Questions
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