Statistical infrequency

• What is statistical infrequency?

  Any relatively usual behaviour can be seen as 'normal' and any behaviour that is unusual is 'abnormal'
• When does statistical infrequency occur?

  When an individual has a less common characteristic
• What is an example of where statistical infrequency measures a behaviour?

  IQ and intellectual disability
• IQ and intellectual disability disorder

  Individuals scoring below 70 are 'abnormal' and only 2% have a scored below 70
• What is the average IQ?

  100
• What percentage of people have an IQ in the range of 85-115?

  68%
• What are people with an IQ below 70 liable to receive a diagnosis of?

  Intellectual disability disorder