Exact number
Read the plotted value carefully and respect the scale.
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GMAT Data Insights
Graphics Interpretation
Read axes, legends, scale, and stacked or dual-axis structure before extracting chart values.
First read
The chart is only useful after you know what each visual element means.
Axes, legend, units, and scale determine how every number should be interpreted.
Framework
Inspect these before calculating.
- 01x-axis labels and intervals.
- 02y-axis unit and scale.
- 03Legend or series mapping.
- 04Whether the question needs an exact value or only a comparison.
Scale trap
A truncated y-axis can exaggerate visual differences.
For bar charts, check whether the vertical axis starts at zero before judging size by bar height alone.
Stacked bars
Stacked bars require segment-versus-total discipline.
A segment height may represent only one category, while the full bar represents the total. Confirm which one the question asks about.
Dual axes
Dual y-axes can map similar-looking lines to different scales.
Trace each series to its own axis before comparing slopes or magnitudes.
Cumulative trap
Cumulative and per-period values answer different questions.
A rising cumulative line does not mean the amount added in each period is increasing.
Match precision to the task.
Relative comparison
Estimate if the difference is clearly large enough.
Mini application
Try this: a stacked bar totals 120, and the lower segment reaches 70.
What does 50 represent?
Solution
The upper segment represents 50.
The total is 120 and the lower segment contributes 70, so the remaining segment is 120 - 70 = 50.
Remember this
Read structure before reading values.
Axis, legend, unit, and segment meaning come before arithmetic.