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Data InterpretationintermediateTNPSCSSCBank PORailway

Data Interpretation — Tables, Charts, and Calculation Strategy | TNPSC, SSC, Bank

Read tables, bar charts, pie charts, and line graphs quickly using percentages, ratios, averages, and option elimination.

~1 min read

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Quick Concept Summary

Data interpretation is not a separate maths universe. It combines percentages, ratios, averages, and careful reading under a chart.

Reading Order

1. Read title and unit. 2. Identify rows, columns, or legends. 3. Note whether values are absolute, percentage, or cumulative. 4. Solve only the asked comparison.

Worked Examples

Example 1

Sales rise from 240 to 300.

Increase = 60

Percentage increase = 60/240 x 100 = 25%

Example 2

A pie-chart sector is 90 degrees.

Share = 90/360 x 100 = 25%

Common DI Formats

  • Tables
  • Bar charts
  • Line graphs
  • Pie charts
  • Mixed charts

Practice Questions

1. Production rises from 500 to 625. Find percentage increase. 2. A category occupies 72 degrees in a pie chart. Find its share. 3. Revenue values are 120, 180, 210, 290. Find the average.

Common Mistakes

  • Ignoring chart units
  • Comparing percentage values with absolute values
  • Calculating more than the question needs

Frequently Asked Questions

Read the title, units, legends, and totals first. Many wrong answers come from missing thousands, percentages, or year labels.

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