Negative Binomial Distribution Calculator
Calculate P(X=k) for r successes.
Formula
P(X=k) = (k-1)C(r-1) * pr * (1-p)(k-r)
Probability that exactly k trials are required to achieve r successes.
Calculate P(X=k) for r successes.
P(X=k) = (k-1)C(r-1) * pr * (1-p)(k-r)
Probability that exactly k trials are required to achieve r successes.