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:
Preoperational Intelligence
A stage in Piaget's theory of cognitive development, where children from ages 2 to 7 engage in symbolic play and struggle with logic and understanding others' perspectives.
Cognitive Development
The process involving the development of thinking and reasoning skills, including perception, memory, conception, judgment, and imagination, from infancy through adulthood.
Early Childhood
A period in human growth and development that spans from birth to eight years old.
Preoperational Intelligence
A stage in Piaget’s theory of cognitive development, typically from ages 2 to 7, where children begin to engage in symbolic play and learn to manipulate symbols but do not yet understand concrete logic.
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