... it usually prevails that people with varying degrees of behaviour are usually distributed around the mean. For instance, when measuring intelligence, the vast majority of the individuals are grouped round the mean and the further away you deviate from this, the fewer people there are. However, there are usually equivalent numbers of people showing extremes of the behaviour, entailing that there would be just as many people with very low intelligence quotients as there would with very high IQs. Also, there would be an equal amount of individuals with an IQ below the mean as there would be people with an IQ above the mean. With nature producing this normal distribution curve, an immediate problem arises: where do you draw the line as to what is normal and what is abnormal? I.e. why should being in the bottom 2.145% make a person abnormal yet being in the bottom 5% makes ...

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