the mean mass of 11 players in a football team is 80.3 kg. the mean mass of the team plus a substitute is 81.2 kg. calculate the mass of the substitute.

Question

this question is about statistics in secondry schools and is about i mean

Answer 1

The total mass of the team is 11*80.3=883.3kg. If we add the mass, m, of the substitute we get 883.3+m kg. The mean is 81.2=(883.3+m)/12; 883.3+m=12*81.2=974.4 so m=974.4-883.3=91.1kg. The mass of the substitute is 91.1kg.