A system operational cycle is presented in the table to the right. As noted, the system experiences 5 failures during its operational cycle. It is repaired after each failure. The probability density function of its distribution has a shape parameter of 2.0. For a cycle time of 450 hours, the reliability of the system is:

\begin{tabular}{|c|c|} \hline OperatingTime(hrs) & TimetoRepair(hrs) \\ \hline 249 & 2 \\ \hline 508 & 4 \\ \hline 387 & 3 \\ \hline 721 & 2 \\ \hline 810 & N/A \\ \hline \end{tabular}