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Civil Service Tests Data Interpretation Questions
Practise data interpretation (data interpretation) for the UK Civil Service Judgement, Verbal & Numerical Tests: 10 multiple-choice questions, each with the correct answer and a worked explanation. Click an option to check it, or “New questions” for another set.
Data Interpretation practice
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Q1.The average of 10 numbers is 46. If 77 is added, what is the new average?
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Answer: B — 48.82
Old total = 10 × 46 = 460. New total = 460 + 77 = 537; new average = 537/11 = 48.82.
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Q2.Sales (units): 2021: 530 · 2022: 300 · 2023: 890 · 2024: 380 · 2025: 340. What was the percentage change in 2023 over 2022?
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Answer: B — 196.67%
Change = 890 − 300 = 590; ÷ 300 × 100 = 196.67%.
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Q3.The average of 11 numbers is 56. If 89 is added, what is the new average?
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Answer: A — 58.75
Old total = 11 × 56 = 616. New total = 616 + 89 = 705; new average = 705/12 = 58.75.
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Q4.The average of 6 numbers is 77. If 108 is added, what is the new average?
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Answer: B — 81.43
Old total = 6 × 77 = 462. New total = 462 + 108 = 570; new average = 570/7 = 81.43.
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Q5.The price of an item changes from £350 to £315. What is the percentage change?
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Answer: C — 10% decrease
Change = -35 on a base of 350: -35/350 × 100 = 10% decrease. Always divide by the ORIGINAL value.
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Q6.The average of 7 numbers is 34. If 70 is added, what is the new average?
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Answer: C — 38.5
Old total = 7 × 34 = 238. New total = 238 + 70 = 308; new average = 308/8 = 38.5.
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Q7.Sales (units): 2021: 450 · 2022: 390 · 2023: 260 · 2024: 690 · 2025: 220. What was the percentage change in 2025 over 2024?
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Answer: A — -68.12%
Change = 220 − 690 = -470; ÷ 690 × 100 = -68.12%.
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Q8.The average of 8 numbers is 60. If 95 is added, what is the new average?
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Answer: A — 63.89
Old total = 8 × 60 = 480. New total = 480 + 95 = 575; new average = 575/9 = 63.89.
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Q9.Sales (units): 2021: 230 · 2022: 550 · 2023: 890 · 2024: 630 · 2025: 900. What was the percentage change in 2024 over 2023?
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Answer: B — -29.21%
Change = 630 − 890 = -260; ÷ 890 × 100 = -29.21%.
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Q10.The price of an item changes from £1,000 to £1,100. What is the percentage change?
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Answer: B — 10% increase
Change = 100 on a base of 1000: 100/1000 × 100 = 10% increase. Always divide by the ORIGINAL value.
How to approach data interpretation questions
Read the table title, units and years before calculating. Approximate first — answer options are often far enough apart that rounding to two significant figures is safe.
About Civil Service Tests
UK Civil Service Judgement, Verbal & Numerical Tests — conducted by UK Civil Service (Government Recruitment Service). Online tests used in many UK Civil Service and Fast Stream applications.
Original practice questions written for this site in the style and difficulty of each exam’s syllabus. They are not past papers and the site is not affiliated with any exam body. Exam patterns, marking schemes and syllabi change — always check the latest official notification.
Civil Service Tests practice topics
| Topic | Section | Question source |
|---|---|---|
| Percentages | Quantitative aptitude | Calculated (new numbers every set) |
| Data Interpretation | Data interpretation | Calculated (new numbers every set) |
| Verbal Reasoning & Analogies | Reasoning | Calculated + question bank |