Those in the upper percentiles know they are more intelligent than average, but they understand that they don't know everything.

The idiots, however, THINK they are smarter than everyone in the room, and believe that if they don't know something then it isn't worth knowing.

Both groups will answer your question the same way, but the idiots will have the most unshakable confidence in their answer.

Take FrankC for example- more than a few times he has blustered about how he is FAR more intelligent that the person he was arguing with on here- highly unlikely given that he has- at best- average intelligence (I am in a charitable mood tonight).

In reality he is just an ignorant, bigoted, old, Alabama white supremacist- trash like that are a dime a dozen. Yet he will proclaim his superior intelligence (and genetics) louder than any actual genius ever would. (Remind you of any presidents?)

Higher intelligence brings with it doubt and second guessing- the idiots have no such troubles. They will always have the advantage of complete unshakable confidence.

65% of Americans believe they are above average in intelligence: Results of two nationally representative surveys

Dunning-Kruger effect (let me know if link doesn't work for you)