The following table shows the number of students in five different classes of a school: What is the percentage of students in Cla…
Data Interpretation ·Previously asked in JKPSC Combined Competitive Examination (JKCCE) 2025
View the full solved paper: JKCCE Prelims 2025 - GS Paper II (Set B)
Question
The following table shows the number of students in five different classes of a school:
| Class | Students | ||
|---|---|---|---|
| --- | --- | ||
| A | 50 | ||
| B | 60 | ||
| C | 70 | ||
| D | 80 | ||
| E | 90 |
What is the percentage of students in Class C with respect to the total number of students in all five classes?
- A. 15%
- B. 20% (Correct answer)
- C. 25%
- D. 30%
Correct Answer
Option B — 20%
Detailed Solution & Explanation
The correct answer is 20%.
Key Points
- Add the five class strengths: 50 + 60 + 70 + 80 + 90 = 350 students in all.
- Class C has 70 students.
- Percentage = (70 ÷ 350) × 100 = 20%.
Additional Information
- The five values form an arithmetic sequence with common difference 10, so the total can also be read off as 5 × 70 = 350, since 70 is the middle (and hence mean) value.
- That shortcut also shows immediately that Class C holds exactly one-fifth of the school, and one-fifth is 20%.
*Ministry of Papers worked solution. The Commission has not yet published the official key for this paper; this answer will be reconciled with it on release.*
Topics covered: Percentage Table Worked Solution