# Calculate > Probability Distributions > Discrete

This utility computes the probability density, cumulative probability, and inverse cumulative probability of a custom discrete distribution. You can specify the values of a random variable in one column and their corresponding probabilities in another, and use them as inputs to this utility.

#### Distribution Parameters:

- Select the column containing values of a random variable.
- Select the column containing the corresonding probabilities.

#### Compute:

- Select the desired type of computation.

#### Input(s):

- If the input data is in a column in the current Datasheet, select the Column radio button and the column name in the drop-down menu.
- In the input data is a single constant, select the Constant radio button and enter the input value in the provided text box.

#### Store Results in: (optional)

- Computed results can be stored in a column of the current Datasheet. If storing results is desired, enter the column name or variable name in the provided text box.