How Many PMP Formula Questions Can I Expect?
This is difficult to say because there is no hard rule for question types.
Ask ten people who have taken the exam and five will say that they saw not a single formula-based question, but the other five will tell you that they were overjoyed they studied the formulas extensively.
So to be safe, you must study and practice all required formulas. And don't forget to include any troublesome formulas on your PMP dump so you can write them down on scratch paper in the first few minutes after your exam has started.
Remember: Questions that need formulas are more than just about 'figuring out the median' or determining the expected monetary value. There are over 45 formulas you need to know and have practiced passing the exam.
Understanding all the details of each formula will allow you to easily answer them -- just in case you are in the group of exam takers who needed to know the formulas.
And finally, will it help you in your future project work to know about those formulas ... for sure.