In a cricket team scores X runs on average over N games, and then scores Y runs in the next game, then the average score for the team over the (N+1) games is :
A
(X+Y)/(N+1)
B
(NX+Y)/(N+1)
C
{N(X+Y)} /(N+1)
D
{N(X+Y)-1}/N
Correct Answer: (NX+Y)/(N+1)