ClarityHow to use this tool
- Enter first success trial, success probability.
- Select Calculate to view the result.
- Check the method and assumptions below before using the result.
The method, explained
P(X = k) = (1 − p)^(k − 1) p.
Using first success trial = 3, success probability = 0.2, the result is 0.128 probability. Change these example inputs to match your task; use the method above to check each step.
What to keep in mind
Independent trials with constant success probability. A descriptive or probability calculation under the stated assumptions. Check the sample design and model before interpreting results.
Common questions
Which inputs does this calculation need?
Find the probability that the first success occurs on a specified trial. Enter first success trial, success probability. The filled example is editable and is not a saved personal record.
How should I interpret the result?
Independent trials with constant success probability. A descriptive or probability calculation under the stated assumptions. Check the sample design and model before interpreting results.
Methodology maintained by ClarityKit. How these tools are built and checked.