In JMeter there are number of listeners available in order to monitor and analyse the results in different parameters and statistics. We need to add an appropriate listener to analyse results which is difficult part of the performance testing. In the below example we will add 'Graph Result' listener. Graph Results listener presents data, average, median, deviation and throughput in a graphical format.
Please do not use listeners during the load test as it consume loads of resources and produce unreliable load test results. You can use when developing and debugging tests.