New listing UCLA BRUINS ADIDAS 1/4 ZIP POLO SHIRT (LRG) NW/TAGS SKY BLUE W/SEWN LOGOS.
It compares people of the same age or age category and assumes that IQ is normally distributed, that the average (mean) is 100 and that the standard deviation is something like 15 (IQ tests sometimes differ in their standard deviations).
IQ test scores have a normal distribution with a mean of 100 and a standard deviation of 15. Approximately 68% people have an IQ between 85 and 115. Added 7/18/2013 1:30:06 PM.