The below table represents a continuous response to a pulse input into a closed vessel which is to be used as a chemical reactor. Calculate the mean residence time of fluid in the vessel , and tabulate the exit age distribution E. (7 marks)

\begin{tabular}{|l|l|l|l|l|l|l|l|l|} \hline Time [min] & 0 & 25 & 50 & 75 & 100 & 125 & 150 & 175 \\ \hline Tracer Output Concentration [g/l] & 0.0 & 9.0 & 15 & 15 & 12 & 6.0 & 3.0 & 0.0 \\ \hline \end{tabular}