Multiple choice

The average weight of a group of 10 students in a primary school is calculated as 15 kg. It is discovered later on that while calculating the average, one student who was 26 was wrongly measured as 36. The correct average weight was- एक प्राइमरी स्कूल में, 10 छात्रों के एक समूह का औसत भार 15 किग्रा. निकाला गया। बाद में यह ज्ञात हुआ कि औसत ज्ञात करते समय एक छात्र का भार गलती से 26 किग्रा. के स्थान पर 36 किग्रा. माप लिया गया। सही औसत भार है-

  1. 20

  2. 18

  3. 16

  4. 14
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Initial total weight = 15 × 10 = 150 kg. One student was recorded as 36 kg instead of 26 kg, an error of +10 kg. Correct total = 150 - 10 = 140 kg. Correct average = 140/10 = 14 kg. Option D is correct.

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