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Hi all.

Yeah. I know. At the time, Normal Distribution and Inverse ND was calculated using constants.

Since the 67 had 224 steps, why wasn’t it possible for the 67, to have a Trapezoidal or Simpson’s routine program with the ND function as the subroutine?

I do not think that this is a problem in principle. In the HP 67/97 Math Pac listing there is as well a program for numerical integration. I think that it is a matter of time and convenience. If the approximation is exact to E-4 this is totally sufficient and it is much faster than numeric integration with the same accuracy.

(11-29-2022 08:08 AM)rawi Wrote: [ -> ]I do not think that this is a problem in principle. In the HP 67/97 Math Pac listing there is as well a program for numerical integration. I think that it is a matter of time and convenience. If the approximation is exact to E-4 this is totally sufficient and it is much faster than numeric integration with the same accuracy.

Good point.