ZforB is a program that I wrote to illustrate how the standard normal distribution (z) can be used to approximate the binomial distribution (b). Switching to caps for readability, and we get ZforB, a small DOS program that you can run and have fun with. I've included an executable file (ZforB.exe) as well as the QuickBasic source code for those of you who want to tinker or are otherwise interested.
Download source code
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