Aim of the applet

Understand the quartile concept

Imput data

• Views on the X axis on which we calculate the box plot. If we introduce the points by the keyboard will have the option choose the frequency (fi) which appears Xi.
• Decimal places to which the approximate quartiles.
• Margin to control the display of the axes from the points of the ends
• "Reset applet" button.

Output data

Box plot.

Quartiles value.

The first steps

From a series of eight points, click with the mouse on the arrow and try to vary the points position. Watch for changes in the quartiles.