The mean IQ score is 100 points, and results fall into a normal distribution curve with a standard deviation of 15 points. This means that 68 percent of people fall within a single deviation, or 85 to 115 points, and 95 percent score between 70 and 135.
There are many different interpretations of IQ scoring, but most classify "normal" intelligence as falling between 91 and 109 points. Approximately 50 percent of the population scores within this range.
IQ scores are not set in stone and may change over time. Studies have shown that IQ scores may fluctuate by as many as 20 points over a few years,