(27S) Probability Formulas

[rprosperi]

Thanks for sharing these Dave, any opportunity to play with a 27S is worthwhile (something not often said about an Algebraic machine; 10BII+ is another exception).

One minor suggestion for these is to include a sample problem with answer to quickly verify the equation is entered correctly. This is often not needed, but the incredibly arcane syntax of the Pioneer Solver makes it very easy to enter these incorrectly.