Word.ws English Dictionary

68-95-99.7 rule

68-95-99.7 rule proper noun: 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.

Proper noun

68-95-99.7 rule

  1. (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.

Questions about 68-95-99.7 rule

What does 68-95-99.7 rule mean?
68-95-99.7 rule means 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.
What part of speech is 68-95-99.7 rule?
68-95-99.7 rule is a proper noun.

Words near 68-95-99.7 rule in the dictionary

  1. 65537-gons
  2. 65th
  3. 66th
  4. 67th
  5. 68
  6. 68-95-99.7 rule
  7. 688
  8. 68th
  9. 69
  10. 69ed
  11. 69er

Source and license

Adapted from Wiktionary: 68-95-99.7 rule (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Cite this entry: “68-95-99.7 rule.” Word.ws, https://word.ws/68-95-99.7_rule. Based on Wiktionary, CC BY-SA 4.0.