How do i get average of the response times from the following sample ?data

Hi Here is my sample data, 2016-05-27 08:36:30,497:INFO :WebContainer : 12: Total time to execute service _prc:aaaa : 796 ms [system]: InvokeSOAPWebservice 2016-05-27 08:36:30,497:INFO :WebContainer : 12: Total time to execute service _prc:aaaa : 7964 ms [system]: InvokeSOAPWebservice 2016-05-27 08:36:30,497:INFO :WebContainer : 12: Total time to execute service _ord:bbb : 3796 ms [system]: InvokeSOAPWebservice 2016-05-27 08:36:30,497:INFO :WebContainer : 12: Total time to execute service _prc:bbb : 1796 ms [system]: InvokeSOAPWebservice How can i get average response times for the above data?