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Secondly they found that, unless something really odd happened in a child's schooling, they tended to maintain the same IQ throughout school. The idea of helping those schoolchildren who are falling behind makes sense (though I don't know how well it worked); the use of IQ in adults is strange.
If you rely on that staying the same through into adulthood (which is a dodgy assumption) then you can "measure" the IQ of adults by asking lots of people lots os questions, calling anyone who gets the average number right an IQ of 100 and sorting the rest of the population by how far above or below the average number of right answers they got, compared to the population as a whole.As far as I can tell this is pointless.
paul, why the apostrophe? Nothing's been missed out and it's nothing's possessive.
"a simple clue to which apostrophe would be helpful. "The one just before the s here"it's easy, there are no "'s in IQ"