CDF (Cumulative Distribution Function) is useful when used in conjunction with probability scales. If x is the number of standard deviations a measurement departs from the mean, then the associated probability (0-100) is:
cdf(x) will plot as a straight line on a probability scale.
Windows 7, 2008,
Vista, XP, NT,
ME, 2003, 2000,
Windows 98, 95