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:
Profitable Hire
An employee whose contributions generate more revenue than the cost of their employment, making them financially beneficial to the company.
Marginal Revenue Product
The additional revenue generated from using one more unit of input, commonly used in decision-making about resource allocation.
Total Revenue
The overall amount of money generated by a business from the sale of goods or services, calculated as the unit price times the quantity sold.
Resource Pricing
The determination of the price for natural resources, influenced by factors such as scarcity, demand, and regulatory policies.
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