Statistics & Probability
Binomial Variance
Variance of a binomial distribution.
Formula
Formula
σ2 = n·p·(1−p)
Variables
| Symbol | Definition | Type & range | Units | Role |
|---|---|---|---|---|
| n | trials | integer (ℤ) | — | input |
| p | success probability | real number (ℝ) | — | input |
Try it yourself
Interactive calculator
Worked examples
Example 1
Giventrials n = 20, prob p = 0.3
Result4.2
Example 2
Giventrials n = 100, prob p = 0.5
Result25