﻿ EXPON.DIST function

# EXPON.DIST function

Returns the exponential distribution. Use EXPON.DIST to model the time between events, such as how long an automated bank teller takes to deliver cash. For example, you can use EXPON.DIST to determine the probability that the process takes at most 1 minute.

## Syntax

EXPON.DIST(x,lambda,cumulative)

The EXPON.DIST function syntax has the following arguments:

• X     Required. The value of the function.

• Lambda     Required. The parameter value.

• Cumulative     Required. A logical value that indicates which form of the exponential function to provide. If cumulative is TRUE, EXPON.DIST returns the cumulative distribution function; if FALSE, it returns the probability density function.

## Remarks

• If x or lambda is nonnumeric, EXPON.DIST returns the #VALUE! error value.

• If x < 0, EXPON.DIST returns the #NUM! error value.

• If lambda ≤ 0, EXPON.DIST returns the #NUM! error value.

• The equation for the probability density function is:

• The equation for the cumulative distribution function is:

## Example

The example may be easier to understand if you copy it to a blank worksheet.

How do I copy an example?

Important   Do not select the row or column headers.

Selecting an example from Help

2. Press CTRL+C.

3. In Excel, create a blank workbook or worksheet.

4. In the worksheet, select cell A1, and press CTRL+V.

Important   For the example to work properly, you must paste it into cell A1 of the worksheet.

5. To switch between viewing the results and viewing the formulas that return the results, press CTRL+` (grave accent), or on the Formulas tab, in the Formula Auditing group, click the Show Formulas button.

After you copy the example to a blank worksheet, you can adapt it to suit your needs.

 1 2 3 4 5 6
 A B Data Description 0.2 Value of the function 10 Parameter value Formula Description (Result) =EXPON.DIST(A2,A3,TRUE) Cumulative exponential distribution function (0.864665) =EXPON.DIST(0.2,10,FALSE) Probability exponential distribution function (1.353353)

Applies To: Excel 2010, Excel Starter, Excel Online, SharePoint Online

﻿