The NORM.DIST function is a Statistical formula that calculates and returns the normal distribution of a value for the specified mean (average) and standard deviation. The NORM.DIST function can calculate either the Normal Probability Density Function or the Cumulative Normal Distribution Function. In this guide, we’re going to show you how to use the NORM.DIST (NORM DIST) function and also go over some tips and error handling methods.
- Excel 2010 and later
Excel NORM.DIST Function Syntax
|x||The value for which you want the distribution.|
|mean||The arithmetic mean of the distribution.|
|standard_dev||The standard deviation of the distribution.|
A logical value which specifies the type of the distribution.
NORM.DIST Function Use Cases
Probability density function
The NORM.DIST function uses the probability density function when cumulative argument is set to FALSE logical value. The equation for the normal density function is where x is the value, μ is the mean and σ is the standard deviation. Enter the mean and standard deviation values into the function to calculate. For example, the normal density function returns 0.34 for value 23, with a mean of 26.44 and standard deviation of 11.17.
If your place the calculated return numbers on a chart, set you will get a bell curve.
Cumulative normal distribution function
The other mode of the NORM.DIST function is the cumulative normal distribution. The cumulative distribution function uses the integral from negative infinity to x of the probability density function. Set the cumulative argument to TRUE logical value to evaluate the cumulative distribution. The other arguments work the same as in the previous example.
If you create a graph from the results of the cumulative normal distribution function, you will get something similar to the following.
- You can use the STDEV.P or STDEV.S functions to calculate the standard deviation for the entire population or a sample respectfully.
- You can use the AVERAGE function to calculate the mean of a data set.
- The NORMDIST is the older version of this function. We recommend refraining from using the NORMDIST function.
- Similar functions:
- The NORM.DIST (NORM DIST) function returns #NUM! error value if the standard_dev argument is ≤ 0.