The normal system used to generate ranges is a gaussian system. The first is applet is Helper 2. Number of Items is the number of rows in the item entry list.
Title is the text that appears at the top of the applet.
Label 1 is the label for the entry field. Label 2 is the label for the result field. Decimals is the number of decimal places in the result. Units is the units field, shown after the result. There are then 3 items for each row of data.