# Calculate > Probability Distributions

The probability distribution utilities perform the following computations for a number of commonly used probability distributions:

- Probability density (Given x, find P(x))
- cumulative probability (Given x, find P(<=x))
- Inverse cumulative probability (Given cumulative probability A, find x such that P(<=x) = A)

You can access these utilities from the Calculate > Probability Distributions menu. In the probability distribution dialog, you will specify the parameters of the distribution (for example, mean, standard deviation, or degrees of freedom). Input data can be a column of values from a Datasheet, or it can be a single constant. Click the Compute button to perform the selected computation. The dialog will remain open until the user clicks the Close button.

The following probability distributions are supported:

### Continuous

- Normal
- Student's t
- Chi-square
- F
- Uniform

### Discrete

- Binomial
- Discrete
- Geometric
- Integer
- Poisson