Learn in the textbookBasic Charts and Visualizing Distributions
DefinitionA histogram (ヒストグラム) splits numeric data into ranges (classes, 階級) and shows how many data fall into each class (the frequency, 度数) as bar height to reveal the shape of the distribution.
ExplanationEach bar stands for a range within an unbroken run of numbers, so the bars sit side by side in class order with no gaps. Where the peak sits, which way the shape leans, and whether there is one peak or two tell you which values the data gather around and how widely they spread.
AnalogySort the whole class's heights into 5 cm ranges and stack one block per person in each range, and a mountain of heights takes shape.
Memory hookBars standing shoulder to shoulder = number ranges that run on without a break.