A box and whisker plot is a graphical method of displaying variation in a set of data. In most cases a histogram provides a sufficient display; however, a box and whisker plot can provide additional detail while allowing multiple sets of data to be displayed in the same graph. Some types are called box and whisker plots with outliers.
Can you compost Leylandii branches and hedge clippings - Yes. We were quite surprised to learn some experienced composters advise not to add Leyandii cuttings as they are apparently too acidic. Composting bacteria can remain active in all but the most acidic conditions.
Though all organic materials eventually decompose, they don't all turn into a compost that's healthy for amending garden beds and potting soils. Compost requires carbon- and nitrogen-producing materials combined with enough water to keep it moist, but only certain organic materials should go into a compost pile or bin.