Data Interpretation
⏱ ~3-min readAceMark Guide
What this topic is really about
In a bar chart the length of each bar reflects the magnitude of the category, so the tallest bar indicates the greatest number of enrolments among the years shown. Choosing 'lowest enrolment' confuses height with small values; the shortest bar, not the highest, would correspond to the minimum enrolment.
The percentage increase is calculated by dividing the absolute change of 10,000 by the original value of 40,000, which yields 25%. Option A (20%) is incorrect because it mistakenly uses the final value of 50,000 as the base in the denominator.
See the mechanism
In a bar chart the length of each bar reflects the magnitude of the category, so the tallest bar indicates the greatest number of enrolments among the years shown. A diagram for this topic isn't available yet — the worked example below walks the same reasoning step by step.
An exam-style question, fully explained
In a bar chart showing enrolment by year, the highest bar represents:
- Identify what the question tests: In a bar chart showing enrolment by year, the highest bar represents:.
- In a bar chart the length of each bar reflects the magnitude of the category, so the tallest bar indicates the greatest number of enrolments among the years shown.
- Choosing 'lowest enrolment' confuses height with small values; the shortest bar, not the highest, would correspond to the minimum enrolment.
Traps the examiner sets
- Choosing 'lowest enrolment' confuses height with small values; the shortest bar, not the highest, would correspond to the minimum enrolment.
- Option A (20%) is incorrect because it mistakenly uses the final value of 50,000 as the base in the denominator.
- Option A (1/2) is incorrect because a half-circle would require a 180-degree angle.
Test your recall
Answer each from memory — you'll see instantly whether you're right and why.
Run a focused 10-question mini-mock on Data Interpretation and see it stick.
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