Why the values of the summary information showing Max, Average and Min response times and the Graph Max, Graph Average and Graph Min response times are different?

The first thing that we need to understand is both the results are derived from the raw results file; which can be extracted from analysis in .csv format.
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Graph data is a subset of raw results, which means a sample of data is taken from raw results and graph is drawn using that; if you make granularity same as data collection frequency the summary and graph results will become same as summary results are directly calculated from raw results.