01 · GRAPHICAL TYPES
Bar Graphs vs Histograms
GRAPHICAL REPRESENTATION
Key Differences
• Bar Graph: Displays discrete data using rectangular bars with equal spacing between them.
• Histogram: Displays continuous grouped data using adjacent rectangles without any gaps between bars.
02 · VARYING CLASS WIDTHS
Adjusted Length of Rectangle
When class intervals have varying widths, height of rectangle is adjusted:
Adjusted Length = (Frequency of Class / Width of Class) × Minimum Class Width