Question

The mean mass of the 15 players in a rugby team is 85.2 kg. The mean mass
of the team plus a substitute is 85.4kg. What is the mass of the substitute?​

Answer 1

The given progression is 16, 11, 6, 1, -4 ….

Clearly (11 – 16) = (1 – 6) = (-4 – 1) = – 5 which is constant

Thus, each term differs from its preceding term by – 5

So the given progression is an AP

Its first term = 16 and the common difference = – 5