It is helpful for determining the reliability of an average. It points out the extent to which the average is the representative of the entire data. It enables comparison of two or more distributions with regard to their variability.
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Every 24 hours, the waters of the ocean rise and fall alternately. This alternate rise and fall in the sea level is known as ‘tide’. The rise of the sea level is called high tide or ‘flow’ and at its lowest point, it is called low tide or ‘ebb’.