Common sense badly needed, but I never expect any from people that type “citation needed” as they are coached by their liberal masters.
Simple math the “norm” is defined as the majority of any given population, data set, collection etc. The outliers are defined as those data points, people, robots, etc. that are so far outside the realm of the norm that they are cannot be considered a part of the natural pattern. There…. basic math and natural since in one succinct paragraph.
You can do you own google or yahoo search and stop pretended you are too ignorant to read.