OK, but there are different tests for different ranges, as I understand it.
So, a test to determine the IQ of an average person is not going to be precise enough to distinguish between the IQs of geniuses.
Presumably you can specifically test for someone with an IQ of zero, by asking them to take a test, and them not doing anything at all because they were born with anencephaly.
(, Wed 10 Dec 2014, 10:06, Reply)