- The weight in kilograms, \(w\), of the 15 players in a rugby team was recorded and the results summarised as follows.
$$\Sigma w = 1145.3 , \quad \Sigma w ^ { 2 } = 88042.14$$
- Calculate the mean and variance of the weight of the players.
Due to injury, one of the players who weighed 79.2 kg was replaced with another player who weighed 63.5 kg .
- Without further calculation state the effect of this change on the mean and variance of the weight of the players in the team. Explain your answers.
(4 marks)