The element X has three naturally occurring isotopes. The isotopic 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 threshold below which a null hypothesis is rejected in a statistical test, often denoted by alpha (α) and commonly set at 0.05 or 5%.
Friedman Test
A nonparametric test for detecting differences in treatments across multiple test attempts.
Friedman Test
A method involving non-parametric statistics aimed at uncovering treatment discrepancies across various attempts.
Sign Test
A nonparametric test used to determine whether the median of a population differs from a specified value by examining the signs of differences rather than their magnitude.
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