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The mean weight per student in a group of seven students is 55 kg if the individual weights of 6 students are 52, 58, 55, 53, 56 and 54; then weight of the seventh student is
A .  55 kg
B .  60 kg
C .  57 kg
D .  50 kg
Answer: Option C
Total weight of 7 students is =55×7=385kg
Sum of weight of 6 students
Weight of seventh student =385328=57kg.

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