... how many people read the new paper each morning, the average IQ of a 16 year old. These statistics can be used to define the norm for a group of people. A norm is something that is usual or regular or typical. If something is not common then it is abnormal. For example, it is not the norm for women to have their first kids below the age of 20 years and above the age of 40 years. If a graph is drawn to represent different aspect of the human behaviour, you will get a normal distribution. This is a bell-shaped curve. In the normal distribution, most people are in the centre group they are known as the normals, they cluster around the mean while there are fewer people the abnormals at either end of the graph. However popular this definition is it has some limitations in its way of ...

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