org.apache.commons.math.distribution

## Interface Distribution

• ### Method Summary

All Methods
Modifier and Type Method and Description
`double` `cumulativeProbability(double x)`
For a random variable X whose values are distributed according to this distribution, this method returns P(X ≤ x).
`double` ```cumulativeProbability(double x0, double x1)```
For a random variable X whose values are distributed according to this distribution, this method returns P(x0 ≤ X ≤ x1).
• ### Method Detail

• #### cumulativeProbability

```double cumulativeProbability(double x)
throws MathException```
For a random variable X whose values are distributed according to this distribution, this method returns P(X ≤ x). In other words, this method represents the (cumulative) distribution function, or CDF, for this distribution.
Parameters:
`x` - the value at which the distribution function is evaluated.
Returns:
the probability that a random variable with this distribution takes a value less than or equal to `x`
Throws:
`MathException` - if the cumulative probability can not be computed due to convergence or other numerical errors.
• #### cumulativeProbability

```double cumulativeProbability(double x0,
double x1)
throws MathException```
For a random variable X whose values are distributed according to this distribution, this method returns P(x0 ≤ X ≤ x1).
Parameters:
`x0` - the (inclusive) lower bound
`x1` - the (inclusive) upper bound
Returns:
the probability that a random variable with this distribution will take a value between `x0` and `x1`, including the endpoints
Throws:
`MathException` - if the cumulative probability can not be computed due to convergence or other numerical errors.
`java.lang.IllegalArgumentException` - if `x0 > x1`