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:
Security Agreement
is a legal document that provides a lender a security interest in a specified asset or property that serves as collateral for a loan.
Online
Connected to or available through the internet or other digital network.
Attachment
The legal process of seizing a debtor's property to secure or satisfy a judgment.
Security Interest
A legal claim on collateral that gives a lender the right to property if a loan is not repaid.
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