Frequency Distribution & Histogram
Group raw data into bins and visualize the shape.
156
260
163
367
171
174
Frequency table
[56, 60)1
[60, 63)2
[63, 67)1
[67, 71)3
[71, 74)1
[74, 78)1
The bin width is (max − min) / bins. Histograms reveal skew, clusters and gaps that a single summary number hides. Try 3 bins vs 9 bins — different widths tell different stories.