89- does invest check give 5 or 4 roles?
4-5, depends on the person. It's about time someone asked that officially! lvl 2 invest gets 2 less results than lvl 1. (still sees them but they will be scratched out)
80- Are there set investigation groupings? Will this information ever be made public to the Town?
No, I random.org all the roles and the top 4 are added in with your role. Any combination is possible. See Day 1 RP for 2 examples of investigation results. The entire paragraph could be in the PM.

Is the answer to question 80 wrong? Should it be the top 3-4 instead?