Sebaran binomial négatip: Béda antarrépisi

If ''X_r'' is a random variable following the negative binomial distribution with parameters ''r'' and ''p'', then ''X_r'' is a sum of ''r'' [[statistical independence|independent]] variables following the [[geometric distribution]] with parameter ''p''. As a result of the [[central limit theorem]], ''X_r'' is therefore approximately [[normalsebaran distributionnormal|normal]] for sufficiently large ''r''.