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The table shows the daily commuting times, in minutes, of a group of office workers.
\[\begin{array}{|c|c|}\hline \text{Time (min)} & \text{Frequency} \\\hline \text{0–9} & 6 \\\hline \text{10–19} & 14 \\\hline \text{20–29} & 22 \\\hline \text{30–39} & 10 \\\hline \text{40–49} & 5 \\\hline \end{array}\]
Find the class centre of the \(30\text{-}39\) class.
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