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The mean weight per student in a group of seven students is 55 kg.  

If the individual weights of six students are 52, 58, 55, 53, 56 and 54, then the weight of the seventh student is 

a
55 kg
b
60 kg
c
57 kg
d
50 kg

detailed solution

Correct option is C

The total weight of seven students is  55×7=385 kg The sum of the weight of six students is 52+58+55+53+56+54=328 kg Hence, the weight of the seventh student is 385-328=57kg

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