Calculate > Probability Distributions > Exponential Calculate > Probability Distributions > Exponential This utility computes the probability density, cumulative probability, and inverse cumulative probability of the exponential distribution. The exponential probability density function, where λ > 0 is the rate parameter, is defined as: The cumulative and inverse cumulative probability distribution function is defined as: Distribution Parameters: Specify the rate parameter of the distribution. 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. To store results in a column, enter the column name or variable name in the provided text box.