The table shows the life expectancy in years of the G8 countries (Datablog, Guardian.co.uk, July 8 2009) .What is the median life expectancy of the eight countries? 
Definitions:
Xylem
A type of vascular tissue in plants responsible for the transportation of water and nutrients from the roots to various parts of the plant.
Conduct Water
The process by which water is transported throughout plants, particularly from roots to leaves, through structures like xylem vessels.
Minerals
Naturally occurring, inorganic substances with a definite chemical composition and crystalline structure.
Charophytes
A group of green algae thought to be the closest relatives of land plants.
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