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

88.4 kg

Step-by-step explanation:

Since we are given the mean we will need to multiply the mean by how many players there are on the team to find the total mass. (The second mean will be multiplied by 16 because it is the number of players on the team plus the substitute)

85.2 x 15 = 1,278

85.4 x 16 = 1,366.4

Subtract the first mass from the second because this will remove the mass of the 15 other players.

1366.4 - 1278 = 88.4

88.4 kg is the mass of the substitute.

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

6e14 is the answer.