"outliers" means they are outside the satistical norm - not to be confused with "out and out liars" which means they are members of some news media or are politicians.
Another phrase would be "at the ends of the bell curve" - again referring to statistics where common occurrences are charted. A large cluster of different events happens often with a few other events happening seldom. So the chart looks like a bell (or derby hat) - the common cases in the middle (tall bars: happens a lot) and the corner cases at the ends (i.e. corners, short bars; happens seldom).
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