The official scoring is done by the league ...
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Goals-against average is the number of goals allowed per full game played, rounded to two decimal points. To get the number,
multiply the total number of goals allowed by 60 and divide by the total number of minutes played. For example, if you have
allowed four goals in 180 minutes your GAA is 1.33 (4 times 60 is 240. 240 divided by 180 is 1.33). The result suggests that
for every full game you play, you will allow 1.33 goals.
Save percentage is the number saves made divided by the total number of shots on goal, expressed in three decimal places.
If you have faced 45 shots and allowed five goals, your save percentage is .888 (40 saves divided by 45 shots). The number
suggests that if you were to face 1,000 shots you would stop 888 of them.