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:
Significance Level
The probability of rejecting the null hypothesis in a statistical test when it is actually true, often denoted by alpha (α) and used as a threshold for determining statistical significance.
LSAT Exam
The LSAT Exam, or Law School Admission Test, is a standardized test administered to prospective law school candidates, assessing reading comprehension, logical, and verbal reasoning proficiencies.
National Average
A statistic that represents the average value for a given variable across an entire nation.
University of Pennsylvania
A prestigious Ivy League university located in Philadelphia, known for its strong programs in business, law, engineering, and medicine.
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