"Average of 5," the official WCA way: take the last 5 solves, throw out the single fastest and single slowest, then average the 3 left. Tossing the extremes stops one lucky or unlucky solve from skewing the score.
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"Average of 12": take the last 12 solves, throw out the single fastest and single slowest, then average the 10 left — so one lucky or unlucky solve can't skew it.
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Scrambles generated by TNoodle where available. Results data owned and maintained by the World Cube Association as of unknown.