the mean of a group of 7 boys is 56 kg . the individual weight ( in kg) of six of them are 52,57,55,60,59,55. find the weight of seventh boy ?????

Let the weight of the 7th boy = x

Mean weight of seven boys = sum of weights of all boys/ total number of boys

56 kg  = ( 52+57+55+60+59+55+x)/ 7

56×7 = 338+ x

392-338= x

x= 54 kg

Therefore weight of 7th boy is 54 kg.

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