AO1- Statistical infrequency

• Statistical infrequency defines abnormality as behaviours that are statistically rare.
• If we plot IQ on a normal distribution, most people will be around the average (mean) with some at either extreme (above or below).
• Statistics are gathered that measure certain characteristics and behaviours with a view to showing how they are distributed throughout the general population.
• What is regarded as rare depends on normal distribution. A normal distribution curve can be drawn to show what proportion of people share the behaviour in question.
• Any individuals who fall outside the normal distributions are perceived as being abnormal.
• Not all infrequent behaviours are considered undesirable. For example , some characteristics such as having a high IQ are statistically rare but also desirable.