This function 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
 Create a blank workbook or worksheet.
 Select the example in the Help topic.
Note Do not select the row or column headers.
Selecting an example from Help
 Press CTRL+C.
 In the worksheet, select cell A1, and press CTRL+V.
 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) 

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