LOGNORM.DIST function
Returns the lognormal distribution of x, where ln(x) is normally distributed with parameters Mean and Standard_dev.
Use this function to analyze data that has been logarithmically transformed.
Syntax
LOGNORM.DIST(x,mean,standard_dev,cumulative)
The LOGNORM.DIST function syntax has the following arguments:

X Required. The value at which to evaluate the function.

Mean Required. The mean of ln(x).

Standard_dev Required. The standard deviation of ln(x).

Cumulative Required. A logical value that determines the form of the function. If cumulative is TRUE, LOGNORM.DIST returns the cumulative distribution function; if FALSE, it returns the probability density function.
Remarks

If any argument is nonnumeric, LOGNORM.DIST returns the #VALUE! error value.

If x ≤ 0 or if standard_dev ≤ 0, LOGNORM.DIST returns the #NUM! error value.

The equation for the lognormal cumulative distribution function is:
LOGNORM.DIST(x,µ,o) = NORM.S.DIST(1n(x)µ / o)
Example
The example may be easier to understand if you copy it to a blank worksheet.
How do I copy an example?

Select the example in this article.
Important Do not select the row or column headers.
Selecting an example from Help

Press CTRL+C.

In Excel, create a blank workbook or worksheet.

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.

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.

