New exercise to strengthen intuition about Bayesian conditional probability. This _1.html file is exercising with "static" values for the various probabilities. The file is ready to add the ability for a user/student to dynamically change the probabilities, to try and match the data in the question. This is probably best done in a _2.html file/exercises.

There are a few possible bugs identified by comments in the file starting with "hmark" and the word "bug"