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.

<div xmlns="http://www.w3.org/1999/xhtml"><p>If a distribution of wages, incomes, turnover, etc. Is arranged, the quartiles are the values which divide the distribution into four equal parts.</p><p>Thus, for a distribution of wages :</p><ul class="list1"><li>the first quartile (generally written Q1) is the wage below which 25% of the wages are situated ;</li><li>the second quartile is the wage below which 50% of the wages are situated. This is the median ;</li><li>the third quartile (generally written Q3) is the wage below which 75 % of the wages are situated.</li></ul><p>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.</p></div>