Long description

A boxplot which consists of a line, a rectangle, known as a box, and a second line. The first line, known as a whisker, starts at capital E subscript capital L, the lower extreme and leads to the midpoint of the left side of the box. Immediately above and at the corner of the box is written capital Q subscript 1. This point is the lower quartile. The box stretches for some way to the right, ending at the upper quartile, with capital Q subscript 3 written above the end of the box and on the same horizontal level as capital Q subscript 1. A second horizontal line, also known as a whisker, starts at the midpoint of the right-hand end of the box and stretches as far as capital E subscript capital U, the upper extreme. The median is marked by capital M above the box at the appropriate position and by a vertical line within the box. Beneath the boxplot are 4 horizontal curly brackets, each of which has 25% written under it. The first stretches from immediately beneath capital E subscript capital L to the start of the box. The second bracket stretches from the start of the box to level with the vertical line level indicating the position of the median. The third stretches from the line level with the median to level with capital Q subscript 3 and the last stretches from level with capital Q subscript 3 to level with capital E subscript capital U.