Statistical Infrequency

• Behaviour is classified as abnormal if it is rare of statistically unusual
• 68% of people have an IQ between 85 and 115
• Less than 2% of the population have an IQ below 70 making them statistically rare

  Regard them as having abnormally low IQs and they can receive a diagnosis of intellectual disability disorder

  They also need to be failing to function adequately for this diagnosis as well
• Less than 2% of the population have an IQ above 130 making them statistically rare

  These people may not be considered abnormal in society however as there is a negative stigma around abnormality - evaluation point