A histogram is a bar graph that represents the frequency distribution of continuous (numerical) data. It shows how data is grouped into intervals (bins) and displays the number of observations within each interval.
Key Features of a Histogram:
✔ Bars represent frequency (count of data points) in each class interval.
✔ No gaps between bars (unlike bar charts) because data is continuous.
✔ The x-axis represents class intervals, and the y-axis represents frequency.
Example: Histogram of Student Test Scores
| Class Interval (Marks) | Frequency (f) |
|---|---|
| 0 – 10 | 5 |
| 10 – 20 | 8 |
| 20 – 30 | 12 |
| 30 – 40 | 10 |
| 40 – 50 | 15 |
🔹 Graph Interpretation:
-
Taller bars indicate higher frequencies.
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The highest bar means the most common score range.