The element X has three naturally occurring isotopes.The masses (amu) and % abundances of the isotopes are given in the table below.The average atomic mass of the element is ________ amu. 
Definitions:
Renal Column
Parts of the kidney's tissue that extend between the pyramids, containing blood vessels and urinary tubes, and serving as a supportive structure for the cortex.
Renal Artery
A blood vessel that supplies oxygenated blood to the kidneys.
Ureter
A tube that carries urine from the kidney to the bladder.
Renal Corpuscles
The filtering structures in the kidneys, each consisting of a glomerulus and a Bowman's capsule.
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