Calculate relative atomic mass of an element which consists of the following isotopes with the i...

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Calculate relative atomic mass of an element which consists of the following isotopes with the indicated relative abundance
\begin{tabular}{l|c|c}
Isotope & Isotopic mass & Natural Abundance \\
\hline 1. & 28.0 & 92.0 \\
\hline 2. & 29.0 & 5.0 \\
\hline 3. & 30.0 & 3.0 \\
\hline
\end{tabular}
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