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infoWhy this? Histograms, frequency polygons, and cumulative frequency charts reveal the distribution of grouped numerical data and how frequencies accumulate. They enable us to compare patterns and estimate values or proportions when individual observations are not available.

scheduleWhy now? Earlier work on tables and graphs provides the foundation for interpreting class intervals, frequencies, and scales. These representations also prepare us to estimate averages and measures of spread from grouped data in subsequent units.