The following data gives the information on the observed lifetimes (in hours) of 225 electrical components: \[ \begin{array}{|c|c|c|c|c|c|c|c|} \hline \text{Lifetimes (in hours)} & 0 - 20 & 20 - 40 & 40 - 60 & 60 - 80 & 80 - 100 & 100 - 120 \\ \hline \text{Frequency} & 10 & 35 & 52 & 61 & 38 & 29 \\ \hline \end{array} \] Determine the modal lifetimes of the components.