\( \text{A grouped frequency table is shown.} \\ \text{Estimate the total weight.} \\ \begin{array}{|c|c|} \hline \text{Weight (kg)} & \text{Frequency} \\ \hline 0\text{--}10 & 2 \\ 10\text{--}20 & 4 \\ 20\text{--}30 & 6 \\ \hline \end{array} \)
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