average run length in graph average run length in excel average run length average run length average run length in xbar chart xbar average run length xbar average run length what is the average run length in excel chart what is the mean run length of the xbar graph average run length chart average run length xbar chart average run length how to calculate average run length the average run length how to calculate the average run length in xbar charts average run length which plot point indicates an out of control situation? what is arl in a bar chart how does arl relate to p in an xbar chart average run length chart