Question

The mean weight of a group of seven boys is 56 kg. the individual weights (in kg) of six of them are 52, 57, 55, 60, 59 and 55. calculate the weight of the seventh boy.

Answer 1

hope this will help you

Answer 2

let the weight of seventh boy is x 

then 

56 = ( 52+57 +55+60+59+55+x)/7

56*7= (338 + x)

392= 338+x

392-338 = x

54= x 

then '

the weight of 7th boy is 54 kg