Quartiles
If a distribution of wages, incomes, turnover, etc. Is arranged, the quartiles are the values which divide the distribution into four equal parts. Thus, for a distribution of wages : - the first quartile (generally written Q1) is the wage below which 25% of the wages are situated , - the second quartile is the wage below which 50% of the wages are situated. This is the median , - the third quartile (generally written Q3) is the wage below which 75 % of the wages are situated. In an equivalent manner, the first quartile is the wage above which 75% of the wages are situated , the second quartile is the wage above which 50% of the wages are situated, and the third quartile is the wage above which 25% of the wages are situated.
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