Calculates the cumulative distribution function for a standard normal random variable (with mean zero and standard deviation one).
QTP_NORMSDIST(z)
This function can be used instead of Excel's built-in NORMSDIST function.
Additional Information
This function is adapted from the NDTR function, provided with the Cephes library, available from Netlib ( http://www.netlib.org/ ).
If X is a normally distributed random variable with E[X] = 0 and var[X] = 1, then QTP_NORMSDIST(z) = Pr{X≤z}.