Geometric Distribution Calculator (Free, Step-by-Step)
Use this free geometric distribution calculator to find the probability that the first success occurs on trial k, along with cumulative probabilities, the mean, variance, standard deviation, and a chart.
The geometric distribution
It models the number of independent trials until the first success, each with probability p. Its mean is 1/p and variance is (1 − p)/p².
Original price was: $109.99.$54.99Current price is: $54.99.
How to use it
- Enter the success probability p and the trial k.
- Press Compute.
Related: the Binomial Probability Calculator and the Poisson Distribution Calculator.
Frequently asked questions
What does k represent?
The trial on which the first success happens (k = 1, 2, 3, …).
Original price was: $109.99.$54.99Current price is: $54.99.
What are the mean and variance?
Mean = 1/p and variance = (1 − p)/p².
Original price was: $109.99.$54.99Current price is: $54.99.
Does it give cumulative probabilities?
Yes — P(X ≤ k) and P(X > k).
Original price was: $27.99.$17.99Current price is: $17.99.
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