NORMINV

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

Syntax

NORMINV(probability,mean,standard_dev)

Probability   is a probability corresponding to the normal distribution.

Mean   is the arithmetic mean of the distribution.

Standard_dev   is the standard deviation of the distribution.

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.

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

NORMINV uses an iterative technique for calculating the function. Given a probability value, NORMINV iterates until the result is accurate to within ± 3x10^-7. If NORMINV does not converge after 100 iterations, the function returns the #N/A error value.

Example

NORMINV(0.908789,40,1.5) equals 42