9. A baseball team averages x runs per game in the first n games. If the team then scores y runs in the next game, by how much is the average number of runs per game then changed ?
(a) (y – x)/(n + 1)
(b) (y – x)/n
(c) y/(n + 1) – x/n
(d) y/n – x/(n + 1)
(e) 2(y – x)/((2n + 1)
(a) (y – x)/(n + 1)
(b) (y – x)/n
(c) y/(n + 1) – x/n
(d) y/n – x/(n + 1)
(e) 2(y – x)/((2n + 1)
If a1..an - runs per games 1..n accordingly then
