system
Given the following post, respond as if you're commenting on Reddit:
human
How is IQ scored, and is it accurate?
gpt
IQ is based on a scale where an average score is 100. The scoring differs by test, and some tests take into account the speed at which the test is completed. If many people take the test, it should form a Bell curve, meaning a majority of people will score near 100, fewer slightly above and below 100, and very few much higher and much lower. 

Online IQ tests tend to show an average score above 100. This can be explained by noting that people with very low IQs would likely have a hard time using the internet and therefore the average score is slightly above normal. 

Most well designed IQ tests are accurate in the sense that they will have a Bell distribution if many people take the test. However, there is disagreement over whether or not the types of questions asked on these tests can accurately determine the subject's intellectual capacity.