If you have 4 or 5 random things that might be assigned is there a way to weigh it so that one might be much more likely or less likely than the others, other than using multiple examples of each outcome and just having more of the one you want more likely?

Right now I have it set up to have a random outcome of 4 possible choices but the probability of each is 1 in 4. Can it be changed so that I can either set probablity for each at least for one specifically?

Yes of course. Let's say we want this
--1--|-2-|------3------|--4--
(width here is proportionnal to weigth)

We'll write this:

("//..." : comment, ignored by Groovy engine)

Thank you. Makes sense.