Averages take in the extremes--both with re: to the number of shots fired, and the number of opponents one might face. Where shots are concerned, there's a 50% chance you'll need less than the average and the same chance for more. Common sense says plan for more, and Murphy says a lot more.
Louis Awberbuck said there's no such thing as an advanced gun fight, and I'd dare say--no such thing as an average one (to those involved), either.
That's not to say that you can't learn from studying other peoples gunfights, but I think the one that really matters is yours.
