Data Interpretation — Study Notes for IBPS PO Prelims

Overview

Data Interpretation (DI) is one of the highest-weighted areas in the IBPS PO Prelims Quantitative Aptitude section, typically contributing 10–15 questions out of 35. The questions test your ability to extract numerical data from tables, charts, or paragraphs and perform calculations involving percentages, ratios, averages, and basic arithmetic.

Unlike standalone arithmetic problems, DI requires you to first understand the data structure, identify what's being asked, and then apply the right formula—all under time pressure. Speed and accuracy in calculation are paramount since DI sets are interconnected; one misread figure can derail multiple answers.

Mastering DI is a guaranteed scoring opportunity. The data is given to you—there's no ambiguity about values. Your job is simply to interpret correctly and calculate efficiently. Students who develop mental math shortcuts and approximation techniques consistently outperform in this section.

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Key Concepts

**Data Extraction First**: Before calculating, spend 15–20 seconds understanding what the table/chart represents—units, time periods, categories. A rushed misread is the most common error.

**Percentage Change Formula**: (New − Old) / Old × 100. This appears in nearly every DI set when comparing years, products, or regions.

**Ratio Interpretation**: When a pie chart shows percentages, the actual value = (percentage/100) × total. For comparing two slices, you can directly compare percentages without calculating absolute values.

**Approximation is Your Friend**: IBPS options are usually spread apart. If options are 234, 267, 298, 342, you don't need exact calculation—round intelligently and eliminate.

**Caselet DI Requires Note-Making**: Word-based DI gives data in sentences. Jot down a mini-table before attempting questions—this prevents re-reading the paragraph five times.

**Missing DI Logic**: When values are missing, set up equations. Often the question itself provides enough constraints to solve for missing cells.

**Work Backwards from Options**: For complex calculations, plug in options to verify rather than solving from scratch.

**Unit Consistency**: Watch for mixing up lakhs/crores, kg/tonnes, or months/years. The exam loves testing attention to units.

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Formulas / Key Facts

| Concept | Formula / Fact | |---------|----------------| | Percentage | Value = (Percentage/100) × Total | | Percentage Change | [(New − Old) / Old] × 100 | | Ratio to Value | If A:B = 3:5 and total = 800, then A = (3/8) × 800 = 300 | | Average | Sum of values / Number of values | | Pie Chart Degree | Degree = (Value / Total) × 360° | | Percentage from Degree | Percentage = (Degree / 360) × 100 | | Growth Rate (Compound) | Final = Initial × (1 + r/100)ⁿ | | Bar/Line Reading | Always check Y-axis scale and starting point (may not be zero) |

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Q1 · Data Interpretation · EASY
The table below shows the number of laptops sold by five different stores (A, B, C, D, E) in two consecutive months (January and February). Store | January | February A | 240 | 300 B | 180 | 270 C | 320 | 280 D | 200 | 250 E | 260 | 310 What is the total number of laptops sold by all five stores in February?
Q2 · Data Interpretation · MEDIUM
The bar graph below shows the production (in thousand tonnes) of wheat by six states (P, Q, R, S, T, U) in the year 2022. P: 45 thousand tonnes Q: 60 thousand tonnes R: 35 thousand tonnes S: 50 thousand tonnes T: 40 thousand tonnes U: 55 thousand tonnes The production of wheat by state Q is what percent more than the production by state R?
Q3 · Data Interpretation · MEDIUM
A pie chart shows the distribution of a company's annual budget of Rs. 72,00,000 across five departments: Marketing, Operations, HR, R&D, and Finance. Marketing: 25% Operations: 30% HR: 15% R&D: 20% Finance: 10% What is the difference (in Rs. lakhs) between the budget allocated to Operations and the combined budget of HR and Finance?
Q4 · Data Interpretation · EASY
The line graph shows the monthly revenue (in Rs. lakhs) of a retail store over six months from January to June. January: 24 lakhs February: 28 lakhs March: 32 lakhs April: 30 lakhs May: 35 lakhs June: 38 lakhs What is the average monthly revenue (in Rs. lakhs) of the store over these six months?
Q5 · Data Interpretation · HARD
The table shows the number of employees in three departments (Sales, Accounts, IT) of a company and the percentage of females in each department. Department | Total Employees | % Females Sales | 450 | 40% Accounts | 300 | 60% IT | 600 | 25% If 20% of the male employees in the IT department are promoted, how many male employees in IT receive promotion?

Notes generated on 22 Jun 2026

Data Interpretation

Data Interpretation — Study Notes for IBPS PO Prelims

Overview

Key Concepts

Formulas / Key Facts

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