411 REFERENCE · Wiktionary
68-95-99.7 rule
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Proper noun
68-95-99.7 rule
en statistics _ mnemonic The rule stating that a normal distribution will have 68% of its observations within one standard deviation of the mean, 95% within two, and 99.7% within three.
Translations
statistics: empirical rule of 3σ
Russian: ru пра́вило трёх си́гм
Further reading