# WorksheetFunction.NormInv Method (Excel)

Office 2010

Returns the inverse of the normal cumulative distribution for the specified mean and standard deviation.

Important

This function has been replaced with one or more new functions that may provide improved accuracy and whose names better reflect their usage. This function is still available for compatibility with earlier versions of Excel. However, if backward compatibility is not required, you should consider using the new functions from now on, because they more accurately describe their functionality.

## Syntax

expression .NormInv(Arg1, Arg2, Arg3)

expression A variable that represents a WorksheetFunction object.

### Parameters

 Arg1 Required Double Probability - a probability corresponding to the normal distribution. Arg2 Required Double Mean - the arithmetic mean of the distribution. Arg3 Required Double Standard_dev - the standard deviation of the distribution.

Double

## Remarks

• If any argument is nonnumeric, NORMINV returns the #VALUE! error value.

• If probability < 0 or if probability > 1, NORMINV returns the #NUM! error value.

• If standard_dev ≤ 0, NORMINV returns the #NUM! error value.

• If mean = 0 and standard_dev = 1, NORMINV uses the standard normal distribution (see NORMSINV).

Given a value for probability, NORMINV seeks that value x such that NORMDIST(x, mean, standard_dev, TRUE) = probability. Thus, precision of NORMINV depends on precision of NORMDIST. NORMINV uses an iterative search technique. If the search has not converged after 100 iterations, the function returns the #N/A error value.