A cumulative percentage curve on a Pareto Chart represents:

The cumulative percentage curve on a Pareto Chart fundamentally illustrates the sum of frequencies for all categories up to the given category. This representation is crucial for understanding both the individual contributions of each category and how they cumulatively affect the overall total.

When the categories in the Pareto Chart are ranked in descending order based on their frequency or impact, the cumulative percentage curve allows us to observe how much of the total is accounted for as we progress along the categories. It reflects the accumulation of occurrences, showing not only the frequency of occurrences for each individual category but also how those occurrences combine as you include more categories.

By constructing this cumulative curve, one can easily identify which categories contribute most significantly to the total and make informed decisions on priorities for improvement efforts. Therefore, this visualization becomes a powerful tool in Six Sigma and quality improvement initiatives, guiding efforts towards the most impactful areas.