Histogram Maker

What does a histogram show?

A histogram groups numerical observations into intervals and shows how many fall in each interval. It reveals concentration, spread, gaps, and unusual values that an average alone can hide.

Use it to examine variation

Scores, durations, and physical measurements are typical inputs. A histogram describes the distribution of a numeric variable; a category comparison belongs in a bar chart instead.

Keep the grouping honest

1. Define the measured variable. Name what each observation represents and include its unit.
2. Use clear interval boundaries. A value exactly on an edge should enter one bin, not two.
3. Start with equal-width bins. Unequal widths require special care with density and area.
4. Retain outliers visibly. Explain exclusions instead of deleting values that make the chart inconvenient.
5. Check sensitivity to bin width. The apparent shape can change when the grouping changes.

A distribution chart from your observations

MyMap organizes supplied values or interval counts into a chart and adjusts the bins when asked. The exam-score example uses ten labeled score ranges; the largest displayed count is in the 70–80 range. Verify the counts and interval rules before interpreting any sample.