Table Interpretation — Summary
Data Interpretation (DI) is a scoring section in placements (TCS, Infosys, banking-style rounds) — a single data set feeds 3 to 5 questions. Tables are the most information-dense DI form, so reading them quickly and applying percentage/ratio/average is the core skill.
Method
- Read the row and column headings first; know exactly what each cell means.
- Common asks: totals, averages, percentage change, ratios, and "which is highest/lowest".
- Percentage change = (new − old)/old × 100; average = total/count.
Sample: units sold —
| Product | 2021 | 2022 |
|---|---|---|
| A | 200 | 250 |
| B | 150 | 180 |
| Total | 350 | 430 |
A's growth = (250 − 200)/200 = 25%. 2022 total = 430; A's share = 250/430 ≈ 58.1%. ✓
Exam Tricks & Tips
- 🎯 Read headings before any calculation — misreading a column loses all the marks.
- 🎯 Compute row/column totals once and reuse them across questions.
- 🎯 Percentage change is always over the OLD (base) value.
- 🎯 For "share of total", divide the part by the relevant total, not the grand total.
- 🎯 Approximate when options are far apart; compute exactly only when they're close.
- ❌ Don't recompute a total for every sub-question — note it once and reuse it.
Expected exam pattern: total/average, percentage change, ratio between cells, and highest/lowest across a table. 3 to 5 questions, ~50 seconds each.
Quick recap: read headings first; percentage change over the old value; average = total/count; compute shared totals once and reuse.
Table Interpretation — Flashcards
Q1. What is Data Interpretation?
A1. Answering questions from a given data set (table, chart, etc.).
Q2. First step with a table?
A2. Read the row and column headings.
Q3. Percentage change formula?
A3. (new − old)/old × 100.
Q4. A grew 200 → 250 — percentage?
A4. 50/200 = 25%.
Q5. Average formula?
A5. Total divided by count.
Q6. 2022 total of 350→? for A 250, B 180?
A6. 430.
Q7. A's share of the 2022 total (430)?
A7. 250/430 ≈ 58.1%.
Q8. Base for percentage change?
A8. The old (earlier) value.
Q9. When can you approximate?
A9. When the answer options are far apart.
Q10. Efficient habit for totals?
A10. Compute once and reuse across questions.
Q11. "Share of total" divides by which total?
A11. The relevant total, not always the grand total.
Q12. Biggest risk in table DI?
A12. Misreading a heading or column.
Table Interpretation
Data-interpretation tables pack a lot of numbers into rows and columns, and the questions reward whoever reads the structure fastest and calculates approximately. Tables are the purest DI form — no visual estimation, just careful row/column reading.
What this topic tests: extracting values from tables and computing totals, averages, ratios and percentage changes quickly.
The method
Beginner — read the frame first
Before any question, note what the rows and columns represent, the units (₹, thousands, %, lakh), and any footnotes. Half of DI errors come from misreading units or the wrong row.
Intermediate — the four core operations
Most table questions ask for one of:
- Total / sum across a row or column.
- Average = sum / count.
- Ratio / difference between two cells.
- Percentage change = (new − old)/old × 100, or share = part/total × 100.
Know which cells feed each, and pull only those numbers.
Advanced — approximate and compare, don't compute exactly
- Placement DI is MCQ — round to 2 significant figures and compare. 4,187 out of 19,842 is roughly 4,200/19,800 ≈ 21%.
- For "which is largest/smallest", compare ratios by cross-multiplication rather than dividing each.
- For percentage growth across years, use fraction approximations (a rise from 250 to 300 is 50/250 = 20%).
Worked example
A table shows a company's revenue (₹ cr): 2021 = 400, 2022 = 460, 2023 = 552. Find the percentage growth in 2023 over 2022.
Growth = (552 − 460)/460 × 100 = 92/460 × 100 = 20%. (Note 460 → 552 is ×1.2, confirming 20% — spotting the multiplier is faster than long division.)
Where it appears
TCS NQT, Infosys, Wipro, Cognizant, Capgemini, Accenture DI sections; tables are the most common DI format.
Speed tricks and shortcuts
- Read units and headers first — avoid the No. 1 DI error.
- Round to 2 significant figures for MCQ comparisons.
- Compare ratios by cross-multiplication, not full division.
- Mnemonic: "Frame, then filter to the cells the question needs."
Ignoring the unit or footnote (e.g. figures "in thousands" or "in %"), or picking the wrong row/column. Always confirm what a cell represents and its unit before computing — a right calculation on the wrong cell scores zero.
- ✓- Note rows, columns, units and footnotes before solving.
- ✓- Core operations: total, average, ratio/difference, % change/share.
- ✓- % change = (new − old)/old × 100; share = part/total × 100.
- ✓- Approximate and cross-multiply for MCQ speed.
- ✓Read the table's frame and units first, pull only the cells a question needs, and compute approximately for MCQs. Spotting a clean multiplier (×1.2 = +20%) often beats long division.
Table Interpretation — Formula Sheet
Key formulas
- Read the exact cell; totals across rows/columns give sums.
- Percentage share = (cell/row or column total)×100.
- Percentage change between periods = (new − old)/old ×100.
- Average of a row/column = sum/count.
- Ratios compare two cells directly.
- ✓- Share = cell/total ×100.
- ✓- % change = (new − old)/old ×100.
- ✓- Average = row sum/count.
- ✓- Ratios compare cells directly.
Usage: compute row/column totals first, then percentages and ratios off them.
Table Interpretation — Worked Example
Worked Example
Problem: The table shows units sold (in thousands) of three products.
| Year | Product A | Product B | Product C |
|---|---|---|---|
| 2021 | 120 | 80 | 100 |
| 2022 | 150 | 90 | 110 |
| 2023 | 180 | 120 | 150 |
By what percentage did total sales in 2023 exceed total sales in 2021?
Solution: Add each year's row to get the yearly total.
- 2021 total = 120 + 80 + 100 = 300
- 2023 total = 180 + 120 + 150 = 450
Increase = 450 − 300 = 150.
Percentage increase = (increase / original) × 100 = (150 / 300) × 100 = 50%.
Always divide by the base year's value (2021), not by 2023.
Answer: 50%.
- ✓- Compute the required row/column totals before doing any comparison.
- ✓- Percentage change = (new − old) ÷ old × 100 — the denominator is the older value.
- ✓- Read the units in the header (here "thousands") so the answer's scale is right.