What does a histogram represent?

A histogram is a graphical representation that shows the frequency distribution of a set of continuous or discrete data. It organizes data into bins or intervals, representing the number of occurrences of values within each range. This visual format allows for a quick and easy understanding of how data is spread, identifying patterns such as the central tendency, variability, and skewness.

In the context of data-driven decision-making and process improvement methodologies like Six Sigma, histograms are particularly useful in identifying areas that may require attention or understanding the distribution of process performance. By seeing how often certain ranges of values occur, teams can make informed decisions about how to optimize processes and improve overall quality.

The other options don't align with what a histogram specifically represents; they refer to timelines, cost distributions, or stakeholder lists, which pertain to project management but not to the graphical representation of data frequency.