Circular Error Probable
In the military science of ballistics, circular error probable (CEP) (also circular error probability or circle of equal probability) is an intuitive measure of a weapon system's precision. It is defined as the radius of a circle, centered about the mean, whose boundary is expected to include the landing points of 50% of the rounds.
Read more about Circular Error Probable: Concept, Conversion Between CEP, RMS, 2DRMS, and R95
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—Penelope Leach (20th century)
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—David Hume (1711–1776)