# NormInv - script and chart function

NormInv() returns the inverse of the normal cumulative distribution for the specified mean and standard deviation.

Syntax:

NormInv(prob, mean, standard\_dev)

Return data type: number

Arguments:

NORMINV arguments

| Argument | Description |
| --- | --- |
| prob | A probability associated<br>with the normal distribution. It must be a number between 0 and 1. |
| mean | A value stating the arithmetic<br>mean for the distribution. |
| standard\_dev | A positive value stating the standard deviation of the distribution. |

This function is related to the NormDist function in the following way:   
`If prob = NormDist(value, m, 
 sd), then NormInv(prob, m, sd) = value`

Limitations:

All arguments must be numeric, else NULL will be returned.

Examples and results:

Examples and results

| Example | Result |
| --- | --- |
| NormInv( 0.6914625, 0, 1 ) | Returns 0.5000 |

## Learn more

* [NormDist - script and chart function](https://help.qlik.com/en-US/qlikview/September2026/Subsystems/Client/Content/QV_QlikView/Scripting/StatisticalDistributionFunctions/NormDist.htm)