Calc. Cumulative Dist. Fnct. for Stnd. Norm. Dist.
Features
The value N(x) of the cumulative distribution function for a normal distribution at point x is approximated as follows:
with:
Calc. Cumulative Dist. Fnct. for Stnd. Norm. Dist. 
Calc. Cumulative Dist. Fnct. for Stnd. Norm. Dist. 
