Do you think it matters that, *in theory,* you'd need to guess at 5 questions in order to practically expect the zero-sum game?
Perhaps it's the difference between EXPECTING to get 2.8 questions correct if you randomly guess at 14 of them, and the fact that on anyone test, you can only get a...
Remember that guessing *is* advocated, but only if you can eliminate at least one answer. I think the reasoning is this:
-if you can eliminate no answers, as previously mentioned, the guessing penalty is set to average out to no benefit to guessing
-if you can eliminate at least one answer...