Inspired by this discussion.

This market resolves to the result of the first official IQ test that Elon takes and is reported to the public. It has to be a real IQ test, not an online test or some similar metric like Raven's Progressive Matricies.

If he's already taken such a test in the past, this market resolves to that number. If the result is outside of the 110-160 range, it resolves to the appropriate end of the range.

(Notably, this market doesn't try to correct for selection bias, such as if Elon chooses to only release the results if they're above a certain number. It just uses the first reported result. I'm also not going to factor in the chance that he's lying, and will take his word for it if he says he got a certain score.)