NISM Banking & SSC, Quantitative Aptitude. Updated Jun 2026, 12-minute read.
Data Interpretation — Master Tables, Charts and Graphs for Banking & SSC
Data Interpretation (DI) carries 15–20 marks in IBPS PO Mains and SSC CGL Tier 2. It's the most time-consuming section — but with the right approach, each DI set can be solved in 3–4 minutes.
Key takeaways
- Always read the question before scanning the data — filter what you actually need to read
- For percentage-based DI: approximate aggressively — most options differ by >2%
- Caselet DI (paragraph-based): draw a table from the paragraph before attempting questions
- Mixed DI (two charts): note that numerator and denominator often come from different charts
- Speed tip: pre-calculate % change formula as (New−Old)/Old × 100 before attempting
- Don't calculate exact answers — use approximation; most options differ enough to identify the right one
Types of Data Interpretation
1. Table-Based DI
Most common type. A table presents data for multiple categories across multiple years/regions.
Strategy: Read the column headings first. Identify which rows/columns each question needs. Don't read the entire table upfront.
Common question types:
- Total/Average for a row or column
- % change year-on-year
- Ratio between two cells
- Finding the maximum/minimum value
2. Bar Graph DI
Bars represent absolute values for categories. Read bar heights carefully — scale matters (each division could be 100 or 10,000).
Common traps: Stacked bar vs grouped bar — read the legend. % change vs absolute change — re-read the question.
3. Pie Chart DI
Each segment shows % of a total. The absolute value = (% / 100) × Total.
Key formula: If Pie A shows distribution of income and Pie B shows distribution of expenditure for the same year, saving = income − expenditure per category.
Two-pie DI: Very common in IBPS PO Mains. One pie for total (e.g., all states), another for sub-category (e.g., urban population). Calculate absolute values first from each pie, then answer questions.
4. Caselet DI (Paragraph DI)
A paragraph gives all data — you must extract and organise it yourself before solving.
Approach:
- Read full paragraph once quickly
- Draw a blank table with categories as rows and variables as columns
- Re-read paragraph to fill in the table values
- Solve questions from your table (not the paragraph)
Time allocation: 2 minutes for table construction, 1 minute per question = 7–8 minutes for a 5-question caselet set.
5. Mixed DI
Two charts together — e.g., line graph for total sales + bar graph for profit %. Questions ask for absolute profit, which requires data from both charts.
Most common cross-chart calculation: Absolute Value = Total × Percentage from another chart.
Calculation Shortcuts
% change shortcut
Use fractions: 1/6 ≈ 16.67%, 1/7 ≈ 14.28%, 1/8 = 12.5%, 1/9 ≈ 11.11%, 1/11 ≈ 9.09%, 1/12 ≈ 8.33%
So if a value goes from 120 to 140, increase = 20/120 = 1/6 ≈ 16.67%.
Approximation rules
- Round off numbers to nearest 50 or 100 for multiplication
- If answer options differ by >5%, approximate aggressively
- Avoid exact calculation — estimate to eliminate 3 wrong options
Frequently asked questions
How many DI sets come in IBPS PO Mains?
IBPS PO Mains typically has 3–4 DI sets out of 35 questions in the Quantitative Aptitude section. Each set has 4–5 questions. DI typically accounts for 15–20 marks out of 60 in the QA section.
What is the best approach to caselet DI when short on time?
If you're short on time, read only the first 2 questions of the caselet first, then extract only the data needed for those two from the paragraph. Solve them. Then read the next questions and extract relevant data. Don't waste time building the full table for all 5 questions upfront.
Written by Arpan Das.
Keep going with Banking & SSC
- Banking Awareness for IBPS PO
- Quantitative Aptitude — Number Series
- Banking & SSC: the full exam guide
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