Data Interpretation
Delhi Police Exam
1. What is Data Interpretation?
Data Interpretation (DI) is the process of analyzing, interpreting, and drawing conclusions from given data. It is a key part of Numerical Ability in Delhi Police exams.
Analyzing Data from Charts & Tables
Drawing Conclusions from Information
Simple Definition:
Data Interpretation = Understanding information from tables, charts, and graphs to answer questions.
Examples of Data Presentation:
| Type | Description | Example |
|---|---|---|
| Table | Data in rows & columns | Sales of items in months |
| Bar Graph | Bars representing data | Population per year |
| Line Graph | Points connected by lines | Temperature changes |
| Pie Chart | Circle divided into sectors | Market share of companies |
| Histogram | Frequency distribution | Marks distribution of students |
2. Basic Steps to Solve DI
Step 1
Read the Question Carefully – Understand what is asked
Step 2
Analyze the Data – Look at trends, totals, and differences
Step 3
Perform Calculations – Percentage, ratio, sum, difference, average
Step 4
Choose Correct Option – Verify the answer with calculations
3. Common Formulas
| Concept | Formula | Example |
|---|---|---|
| Sum / Total | Add given values | 10+20+30 = 60 |
| Average | Total / Number of items | 60/3 = 20 |
| Percentage | (Part/Total)×100 | 20/60 × 100 = 33.33% |
| Ratio | Compare two quantities | 20:40 = 1:2 |
| Difference | Subtract values | 50–30 = 20 |
| Proportion | Part/Whole = x/y | 15/60 = 1/4 |
4. Types of Questions
| Type | Description | Example |
|---|---|---|
| Table-Based | Data in tabular form | Sales of 5 products over 6 months |
| Bar Graph | Height of bars represents quantity | Compare sales of different months |
| Line Graph | Trend over time | Temperature or profit trend |
| Pie Chart | Sector shows percentage | Market share of companies |
| Mixed | Multiple formats | Table + Bar graph combined |
5. Shortcut Tricks
| Concept | Trick / Shortcut |
|---|---|
| Quick Sum | Add row-wise or column-wise first |
| Percentage | Use fraction ×100 |
| Average | Use Total ÷ Count |
| Ratios | Simplify numbers |
| Approximation | Round numbers |
6. Real-Life Analogy
DI is like reading a report or chart at work:
Table
A spreadsheet
Bar Graph
Sales comparison
Pie Chart
Market share distribution
Purpose
Helps make decisions based on numbers
7. Common Delhi Police / SSC Exam Facts
Focus is on Tables, Bar Graphs, Pie Charts
Quick calculations of sum, average, percentage, ratio are essential
Data interpretation + reasoning questions often appear together
Approximation and elimination saves time
8. Practice Questions (Exam-Type)
| No. | Question | Solution | Answer |
|---|---|---|---|
| 1 | Sales of 5 items: 20, 30, 50, 40, 60. Find total | 20+30+50+40+60=200 | 200 |
| 2 | Average of above sales | 200 ÷ 5 | 40 |
| 3 | Percentage of item 3 | 50/200 ×100 | 25% |
| 4 | Ratio of item1:item5 | 20:60 = 1:3 | 1:3 |
| 5 | Difference between highest & lowest | 60–20 | 40 |
9. Quick Recap
| Concept | Summary |
|---|---|
| Table | Data in rows & columns |
| Graph | Bar, Line, Pie for visualization |
| Sum / Total | Add values |
| Average | Total ÷ Count |
| Percentage | Part/Whole × 100 |
| Ratio / Proportion | Compare two quantities |
| Shortcut | Approximation, elimination, quick math |
You've completed Data Interpretation Concepts!
Courage Tip: Practice reading different types of charts and tables quickly. Master the basic calculations of percentage, average, and ratio as they form the foundation of most DI questions in Delhi Police exams.
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