# NORMDIST function

 In Excel 2010, several functions have been implemented with new algorithms for improved accuracy.Read a blog post or try Office 2010!

Returns the normal distribution for the specified mean and standard deviation. This function has a very wide range of applications in statistics, including hypothesis testing.

Syntax

NORMDIST(x,mean,standard_dev,cumulative)

X     is the value for which you want the distribution.

Mean     is the arithmetic mean of the distribution.

Standard_dev     is the standard deviation of the distribution.

Cumulative     is a logical value that determines the form of the function. If cumulative is TRUE, NORMDIST returns the cumulative distribution function; if FALSE, it returns the probability mass function.

Remarks

• If mean or standard_dev is nonnumeric, NORMDIST returns the #VALUE! error value.
• If standard_dev ≤ 0, NORMDIST returns the #NUM! error value.
• If mean = 0, standard_dev = 1, and cumulative = TRUE, NORMDIST returns the standard normal distribution, NORMSDIST.
• The equation for the normal density function (cumulative = FALSE) is:

• When cumulative = TRUE, the formula is the integral from negative infinity to x of the given formula.

Example

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

How to copy an example

1. Create a blank workbook or worksheet.
2. Select the example in the Help topic.

Note    Do not select the row or column headers.

Selecting an example from Help
1. Press CTRL+C.
2. In the worksheet, select cell A1, and press CTRL+V.
3. 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.
A B
Data Description
42 Value for which you want the distribution
40 Arithmetic mean of the distribution
1.5 Standard deviation of the distribution
Formula Description (Result)
=NORMDIST(A2,A3,A4,TRUE) Cumulative distribution function for the terms above (0.908789)
=NORMDIST(A2,A3,A4,FALSE) Probability mass function for the terms above (0.10934005)

Applies to:
Excel 2007