Definitions of Abnormality


Statistical Infrequency

  • Behaviours that are statistically rare are seen as abnormal.
  • Depends on normal distribution curve
  • Most people are aroudn the mean e.g. average IQ is 100.
  • Anyone outside the average usually two SD away from the mean are considered statistically rare (abnormal)
  • An IQ of 70 or 130 --> statistically rare (abnormal)

Deviation from Social Norms

  • Each societu has norms people must follow
  • Implicit= unwritten norms e.g. queuing
  • Explicit = written norms e.g. dont murder
  • These who dont do what society deems acceptable are considered


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