Estimate total hours spent revising from the table.
\( \begin{array}{l} \text{Estimate total hours spent revising:} \\ \begin{array}{|c|c|} \hline \text{Time (hours)} & \text{Frequency} \\ \hline 0--2 & 1 \\ 2--5 & 5 \\ 5--10 & 6 \\ \hline \end{array} \end{array} \)
Choose one option:
Check multiplications and sums before rounding to nearest whole number.
Multiply midpoints by frequency, sum, then round if required.
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