The curved line lets you know at a quick glance which bar has the most bang for buck, and the intersection with the 80% line tells you at what point you need to stop to be able to handle the first 80%. It’s confusing because of the double y-axis. But the graph at the end tells you that column A + column B add up to 80%.

I agree to a point. However, a pareto chart prevents jumping to the root cause of a problem and its a good visual to share with personnel to see how outages and their improvements help an organization.

i have the same question .. it´s so different of other videos

I also had the same issue when I first saw this. First you need to know the rules of a Pareto Chart: Rule #1: The frequency bars (blue bars above) must have the highest values on the left and decrease accordingly as you move right. Rule #2: Your percentage line (red dotted line above) must increase to 100% as you continue right. So, in the graph above, there are two Y-axis. The first one (on the left) has the frequency (how many times a defect occurs) 1-10 occurrences. The other Y-axis (on the right) shows the relative frequency a.k.a. the percentage of occurrence, 1-100%. This percentage represents how much a single defect (a,b,c, or d) occurs compared to the total amount of defects. The blue bars are explained by the y-axis on the left and the line is explained by the y-axis on the right. For example: from above it looks like there are a total of 20 defects that have occurred. Of those 20 total defects, Defect A occurred 8 times (8/20) = 40%. As you continue right you accumulate (add) the occurrences in order to place your line in the correct location. Continuing....Defect B occurred 5 times out of the total 20 times so...(5/20)=25%. Once the line is at the B defect bar above, the line should be at 40%+25%=65%. You continue this with each bar until you reach 100%. If this unclear I understand. This should not make sense in a youtube comment section.

@@sampat7789 thank you!! the only reason I clicked on this video is to find out what does the line mean yet the video didn't explained it

@@sampat7789 This comment is what made coming to this video worth it.

​@@sampat7789 thank you

If he did a Pareto chart of reasons why people come to this video, he would have also come to your conclusion.

@@tylerfoster729 Well said

no

I think the answer to your question is that the example is a simplified one for the sake of explaining what the chart is and how it works. In reality, you could have a scenario with many more factors that cause a problem(s) but you don't how many or which ones to focus on so you figure that out by doing this exercise. For example, you could have a scenario in which after you make the chart you learn that 80% of the cause of the problem is caused by 3 factors, rather than just 1, which meet that percentage threshold. Now you know how many and which causes to focus on fixing. With that said, that's my interpretation so take it with a grain of salt.