Question

the mean weight of 6 boys in a group is 48.the individual weight of five of them are 51 kg,45kg,49kg,46kg,44kg.find the weight of the sixth boy

Answer 1

let the weight of the 6 boy be x
mean = sum of all observations/total no. of observations
$48 = \frac{51 + 45 + 49 + 46 + 44 + x}{6} \\ 288 = 51 + 45 + 49 + 46 + 44 + x \\ 288 - 235 = x \\ x = 53$
therefore the weight of 6th boy=53 kg
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