एक कक्षा में तीन समूह A, B और C हैं। यदि समूह A से एक विद्यार्थी और समूह B से दो विद्यार्थियों को समूह C में स्थानांतरित किया जाता है, तो कक्षा के विद्यार्थियों के औसत भार का क्या होगा?
Read this question in English
In a class, there are three groups A, B and C. If one student from group A and two students from group B are shifted to group C, then what happens to the average weight of the students of the class?
(a) It increases. · (b) It decreases. · (c) It remains the same. · (d) No conclusion can be drawn due to insufficient data.
उत्तर और व्याख्या · explanation in English
Answer: (c) यह वही रहेगा।
Shifting students between groups inside the class changes the group averages but not the class as a whole: the same students with the same total weight remain. So the class average stays the same.
- Class average = total weight of all students ÷ number of students in the class.
- Moving students from A and B to C keeps every student in the class.
- Both the total weight and the head count are unchanged, so the class average is unchanged.
Remember · Ask which total is being averaged; moving members within that total leaves its average unchanged.
Question and answer: UPSC's official GS Paper II (2020, Series A) — paper ↗ · answer key ↗. Explanation: Minimalist IAS, checked 30 Sept 2026 (how we verify). ·