Postby **Orion311** » Fri Feb 06, 2015 10:54 am

The scale is built as a rank-ordering scale. If 1000 people with IQs of 195 studied for a full year straight and took it (and no one else took it), the median would be 150, because that is literally how the scale is defined. The numbers are built to correspond to percentiles.

Edit: Of course, they're meant to be reliable across different test dates, so we'd have to assume that this was what every testing body looked like. But this is basically like asking how so many people manage to only score 100 on an IQ test. The test is built such that 100 is median and 100 is defined as the median, so it's not a very meaningful question.