Patwari Exam · Reasoning
Data Interpretation in Reasoning
This note explains how to read bar graphs, pie charts, line graphs, and tables for data interpretation questions.
- Reasoning & Numerical Ability
- 5 min read
Verified 6 October 2026
Key Formulas & Methods
- Bar graph
- Bar graph: values on the Y-axis, categories on the X-axis; read the value from the height.
- Pie chart
- Pie chart: 360° of the circle = 100% total; % of a part = angle/360 × 100.
- Line graph
- Line graph: change over time; slope = rate of increase/decrease.
- Table data
- Table: data in rows × columns; calculate percentage, ratio, difference.
- Average (DI)
- Average DI: add up all the values, divide by the count.
- Change percentage
- Change%: (current − previous)/previous × 100.
- Exam tip
- Exam tip: before reading the question, read the title and units of the graph/table.
Frequently Asked Questions
How do you find the percentage of a part in a pie chart?+
In a pie chart, 360° of the circle equals 100% of the total, so the % of a part is found as angle/360 × 100.
How is percentage change in data found?+
Change% is found using the formula (current − previous)/previous × 100.
What is the best tip for solving Data Interpretation questions?+
Before reading the question, carefully read the title and units of the graph or table.