Taking Political Party on the x-axis and seats won on the y-axis.
(i) Steps of construction of histogram :
Plot the political parties on x-axis.
Plot number of seats won on y-axis by taking 1 unit = 10 seats.
To represent our first Head, i.e., party A, we draw a rectangular bar with width 1 unit and height 75 units.
Similarly, other Heads are represented leaving a gap of 1 unit in between two consecutive bars.
(ii) From graph,
The maximum no. of seats won are 75 by political party A.
Hence, political party A has won the maximum number of seats.
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CBSE Class IX | Academic Year 2026-2027
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Mathematics | StatisticsWeb Content • Interactive Notes
Statistics — Interactive Study Guide
Histogram vs Bar Graph
| Feature | Bar Graph | Histogram |
|---|---|---|
| Data type | Discrete/categorical | Continuous/grouped |
| Gaps | Yes (between bars) | No (bars touch) |
| Unequal widths | Not applicable | Use frequency density |
Mean, Median, Mode
Mean: Sum of all values / count. Affected by extreme values.
Median: Middle value (after sorting). Not affected by extreme values.
Mode: Most frequent value. Can have multiple modes or no mode.
Quick Self-Check
- Mean of 2, 4, 6, 8, 10? (30/5 = 6)
- Median of 3, 1, 7, 5, 9? (Sorted: 1,3,5,7,9. Median = 5)
- Mode of 2, 3, 3, 5, 5, 5, 7? (5)