On average, Shelby scores half as many as Carter per game for an average of 4/2=<<4/2=2>>2 goals per game.
Judah, on average, scores three less than twice as many goals per game as Shelby, for a total of (2*2)-3=<<2*2-3=1>>1 goal per game.
Therefore, the average total number of goals scored by the team per game is 4+2+1=<<4+2+1=7>>7 goals per game.
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