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# EXPON.DIST function: Description, Usage, Syntax, Examples and Explanation

## What is EXPON.DIST function in Excel?

EXPON.DIST function is one of Statistical functions in Microsoft Excel that 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 of EXPON.DIST function

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.

## EXPON.DIST formula explanation

• 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 of EXPON.DIST function

Steps to follow:

1. Open a new Excel worksheet.

2. Copy data in the following table below and paste it in cell A1

Note: For formulas to show results, select them, press F2 key on your keyboard and then press Enter.

You can adjust the column widths to see all the data, if need be.

 Data Description 0.2 Value of the function 10 Parameter value Formula Description Result =EXPON.DIST(A2,A3,TRUE) Cumulative exponential distribution function 0.86466472 =EXPON.DIST(0.2,10,FALSE) Probability exponential distribution function 1.35335283