Q.

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

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a

55 kg

b

60 kg

c

57 kg

d

50 kg

answer is C.

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Detailed Solution

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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