Estimate total hours studied from a grouped frequency table.
\( \begin{array}{l} \text{Table shows hours studied per week:} \\ \begin{array}{|c|c|} \hline \text{Hours} & \text{Frequency} \\ \hline 0--5 & 2 \\ 5--10 & 6 \\ 10--15 & 7 \\ 15--20 & 5 \\ \hline \end{array} \\ \text{Estimate total hours studied.} \end{array} \)
Choose one option:
Check calculations at each step to avoid errors.
Use midpoints, multiply by frequency, sum for total study hours.
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