Chapter 2 of 6

33%

SBI Clerk Numerical Ability★ ~6-7 of the section's 35-40 questions

Data Interpretation

Clerk-level DI stays to a single table, bar or line chart with straightforward percentage, ratio and average questions — no caselets, no missing-value puzzles, no data sufficiency layered on top, unlike the PO-level version of this topic.

⏱ 5 min readEasy difficulty✓ Free · exam-pattern aligned

Timed practiceMCQs from this chapter with instant scoring

FlashcardsFormulas & traps on spaced repetition

SBI Clerk PYQsSolved previous-year questions

By the end of this chapter you'll be able to…

1Read a bar, line or table chart's labels, units and scale accurately before calculating
2Compute a chart's total, average and each category's share of the total
3Distinguish a 'difference' question from a 'ratio' question and compute the correct one
4Compare one category to the average of the REMAINING categories, excluding it from both sum and count
5Compute percentage change across two points on a line chart using the earlier value as the base

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Why this chapter matters in SBI Clerk

Clerk-level DI uses only a single chart per set — no caselets, missing values or data sufficiency layered on top like PO-level DI — so the entire difficulty is reading the chart correctly. The arithmetic itself is the same percentage/ratio/average toolkit taught throughout this cluster.

Before you start — revise these

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Arithmetic Word Problems

Percentage, ratio and average calculations taught there are applied directly to chart-based questions here.

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Simplification & Approximation

Fast, accurate arithmetic is assumed fluent so DI questions are limited by reading speed, not calculation speed.

Data Interpretation — IBPS Clerk / SBI Clerk

Clerk-level Data Interpretation is deliberately simpler than the PO-level version of the same topic: a single table, bar chart or line chart carries every question in a set, without the caselets, missing-value puzzles or embedded data-sufficiency questions that appear at PO level. The arithmetic itself — percentages, ratios, averages, differences — is identical to the Arithmetic Word Problems chapter; the only added skill is reading the chart accurately before calculating.

1. Reading the chart correctly, before calculating anything

Every DI set's entire difficulty sits in accurate reading — scan the chart once for its labels, units and scale before answering any individual question, since a single misread value produces a confidently wrong answer regardless of correct arithmetic afterward. A bar chart's y-axis scale matters as much as the bar heights themselves — a chart scaled in "hundreds" changes every answer by a factor of 100 if misread as raw units.

Finding a chart's total is direct summation; the average is that total divided by the number of categories; a category's "share of total" is its own value divided by the total, expressed as a percentage. These three calculations recur in nearly every clerk-level DI set and are the fastest points available once the chart is read correctly.

3. Difference and ratio between two categories

A "difference" question subtracts one category's value from another directly; a "ratio" question expresses the same two values as a simplified ratio rather than a subtracted difference — reading which is actually being asked prevents answering the wrong calculation. Both questions use the exact chart values without any further estimation, once those values are correctly read.

4. Comparing one category against the average of the rest

A frequent clerk-level DI question asks how one category compares to the AVERAGE of the remaining categories, not the overall average including itself — this distinction changes the divisor and is a common misreading trap. Excluding the category in question from both the sum and the count before computing the average of "the rest" is what the question is actually asking for.

5. Percentage change across a line chart

A line chart's percentage-change question uses the same formula as any percentage increase — (new value minus old value), divided by the OLD value, times 100 — applied to two specific points read directly off the chart. As with any percentage-change question, the correct base is always the EARLIER value, never the later one.

Worked Examples

A bank's five branches report the following number of active savings accounts.

Branch	A	B	C	D	E
Accounts	420	580	350	650	500

Example 1. Find the total number of accounts across all five branches, and the average per branch.

Total $= 420 + 580 + 350 + 650 + 500 = 2, 500$ . Average $= 2500 \div 5 = 500$ .

Answer: Total = 2,500, Average = 500.

Example 2. What percentage of the total accounts does Branch D hold?

$\frac{650}{2500} \times 100 = 26%$ .

Answer: 26%.

Example 3. Find the difference in accounts between Branch B and Branch C.

$580 - 350 = 230$ .

Answer: 230.

Example 4. How does Branch D's account count compare to the AVERAGE of the other four branches (A, B, C, E)?

Sum of the other four: $420 + 580 + 350 + 500 = 1850$ . Their average: $1850 \div 4 = 462.5$ . Branch D (650) exceeds this average by $650 - 462.5 = 187.5$ accounts.

Answer: Branch D exceeds the average of the other four branches by 187.5 accounts.

A company's annual revenue (₹ lakh) over five years is shown below.

Year	2019	2020	2021	2022	2023
Revenue	180	200	240	210	270

Example 5. What percentage of the 5-year total revenue does 2021 represent?

Total $= 180 + 200 + 240 + 210 + 270 = 1, 100$ . $\frac{240}{1100} \times 100 \approx 21.8%$ .

Answer: approximately 21.8%.

Example 6. Find the percentage change in revenue from 2022 to 2023.

$\frac{270 - 210}{210} \times 100 \approx 28.6%$ .

Answer: approximately 28.6% increase.

Summary

Clerk-level DI stays to a single chart per set, with no caselets or missing-value layers — the entire difficulty is reading the chart's labels, units and scale correctly before calculating anything.

Total (summation), average (total ÷ count) and share of total (category ÷ total × 100) are the three most frequent calculations. Reading whether a question asks for a difference (subtraction) or a ratio (simplified proportion) determines which calculation is actually needed.

A question comparing one category to "the average of the rest" excludes that category from both the sum and the count — a common misreading trap when rushed. Percentage change always uses the EARLIER value as the base, never the later one.

Key formulas & results

Everything to memorise for the exam hall, in one card. Screenshot this for revision.

Share of total

Share % = \frac{Category value}{Total} \times 100

The most frequent single calculation in clerk-level DI.

Average excluding one category

Average of the rest = \frac{Total - Excluded category}{Count - 1}

Excludes the category in question from both the sum and the count.

Percentage change

% change = \frac{Later value - Earlier value}{Earlier value} \times 100

The base is always the EARLIER value, never the later one.

SBI Clerk test series

Ready to be tested on this?

Data Interpretation shows up in every SBI Clerk paper — sit a timed one and find out where you actually stand.

7–9Qs in Prelims

Very highpriority

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Traps SBI Clerk sets — and how to dodge them

These are the exact option-traps and misreads that cost marks under negative marking.

WATCH OUT

✗ Misreading a chart's y-axis scale (e.g. treating a 'hundreds' scale as raw units)

✓ Check the axis label and scale explicitly before reading any bar or line value off the chart.

Why it happens: A scale misread multiplies or divides every single answer in the set by the same wrong factor, producing consistently wrong but internally consistent answers.

WATCH OUT

✗ Including a category in its own comparison average (comparing it to the average of ALL categories including itself)

✓ When asked to compare a category to 'the average of the rest,' exclude that category from both the sum and the count before computing.

Why it happens: Including the category in its own comparison average changes the divisor and produces a subtly wrong comparison, even though every individual number was read correctly.

WATCH OUT

✗ Using the later value as the base in a percentage-change calculation

✓ Always divide by the EARLIER value — (later - earlier) / earlier x 100.

Why it happens: The percentage change describes how much the value moved relative to where it started, which is the earlier value, not where it ended up.

WATCH OUT

✗ Computing a difference when the question actually asks for a ratio, or vice versa

✓ Read the question's exact wording before calculating — 'difference' means subtraction, 'ratio' means expressing the two values as a simplified proportion.

Why it happens: The two calculations use the same two chart values but produce completely different answers, so misreading which is asked gives a confidently wrong result.

Exam-pattern practice

PYQ-style questions with full solutions. Work through them as a readiness check — mark yourself honestly and get your gap report at the end.

Readiness check

Are you exam-ready for Data Interpretation?

8 problems from this chapter. Try each one, reveal the worked solution, mark yourself honestly — get your gap report at the end.

8 questions~6 min

5-minute revision

The whole chapter, distilled. Read this the night before the exam.

•Scan the chart's labels, units and scale once before answering any question in the set — a misread scale multiplies every answer by the same wrong factor.
•Total is direct summation; average is total divided by count; share of total is category value divided by total, as a percentage.
•'Difference' means subtraction; 'ratio' means a simplified proportion — read the exact wording before calculating.
•Comparing a category to 'the average of the rest' excludes that category from both the sum and the count.
•Percentage change always divides by the EARLIER value, never the later one.

SBI Clerk question blueprint

How this topic is asked, tier by tier — so you can prep to the pattern.

Typical weightage: Data Interpretation contributes an estimated 6-7 of the Numerical Ability section's questions

Question style	Marks each	Typical count	What it tests
Total and average	4	~2	Computing a chart's total and average correctly
Share of total	4	~2	Computing a category's percentage share of the total
Difference and ratio	4	~1	Correctly distinguishing and computing a difference vs. a ratio
Average excluding one category	5	~1	Excluding a category from both sum and count when comparing it to 'the rest'
Percentage change	5	~1	Using the earlier value as the base for percentage change

Prep strategy

Day 1: chart-reading discipline (scale, labels, units) with timed drills on small tables and bar charts.
Day 2: total, average, share of total and difference/ratio questions.
Day 3: average-excluding-one-category and percentage-change questions, then mixed timed practice.

Exam-hall strategy

Battle-tested tips from mentors and toppers for this topic under the sectional clock.

Spend the first few seconds of any DI set scanning the chart's title, axis labels and scale before answering the first question.
Compute totals and averages once, mentally or on the rough sheet, and reuse them across multiple questions in the same set rather than recomputing.
For 'average of the rest' questions, explicitly subtract the excluded category from both the sum and the count before dividing.
For percentage-change questions, double-check which value is earlier before dividing — this is the single most common clerk-level DI error.
Attempt DI sets after the faster, more mechanical topics (Simplification, Number Series) if time is short, since DI sets take longer per question even at clerk level.

Beyond the exam

Where this skill shows up in the job you're competing for — and in life.

Reading business dashboards

Computing a share of total, a period-over-period percentage change, or comparing one branch/product to the rest is exactly how sales and performance dashboards are read in real banking and business roles.

Quick chart literacy

Scale-checking before reading values off a chart is a durable habit useful for interpreting any bar, line or pie chart encountered outside the exam.

Where else this topic is tested

Prepare once, score in every exam that asks it.

IBPS PO / SBI PO Data Analysis & InterpretationHigh — same core skill, tested with caselets and missing-value complexity added

SSC CGL Data InterpretationModerate — overlapping chart-reading and calculation skills

CUET UG Data Interpretation & StatisticsLow-Moderate — shares the underlying percentage/average toolkit at a simpler level

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Questions aspirants ask

Pulled from the Q&A community and mentor sessions.

Roughly 6-7 of the section's 35-40 questions, based on pattern analysis of the exam's topic weightage.

No — clerk-level DI stays to a single chart per set with straightforward percentage/ratio/average questions, while PO-level DI adds caselets, missing-value puzzles and embedded data sufficiency, making it noticeably harder.

Misreading the chart itself — especially the axis scale — rather than the arithmetic that follows. Scanning the chart's labels and scale before calculating prevents this.

The overall average includes every category; 'average of the rest' explicitly excludes the category being compared, from both the sum and the count, which changes the divisor and the result.