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Each rock in a collection of 70 rocks was classified as either igneous, metamorphic, or sedimentary, as shown in the frequency table.<br/><br/>$\begin{tabular}{|l|c|} \hline<br/>\textbf{Classification} & \textbf{Frequency} \\ \hline <br/>igneous & 10 \\ \hline <br/>metamorphic & 33 \\ \hline <br/>sedimentary & 27 \\ \hline <br/>\end{tabular}$<br/><br/>If one of these rocks is selected at random, what is the probability of selecting a rock that is igneous?