Calculate > Probability Distributions > Poisson Calculate > Probability Distributions > Poisson This utility computes the probability density, cumulative probability, and inverse cumulative probability of the Poisson distribution. Distribution Parameters: Specify the mean value (must be a positive number). 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.