32 छात्रों के एक समूह का औसत वजन 18.5 किग्रा था। जब 4 छात्रों ने समूह छोड़ दिया, तो औसत घटकर 15.5 किग्रा रह जाता है। उन 4 छात्रों का औसत वजन (किग्रा में) कितना था?

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  1. 39.5
  2. 37.5
  3. 27.5
  4. 36.5

Answer (Detailed Solution Below)

Option 1 : 39.5
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दिया गया है:

औसत = 18.5 किग्रा

कम होने के बाद औसत = 15.5 किग्रा

प्रयुक्त सूत्र:

औसत = सभी प्रेक्षणों का योग/प्रेक्षणों की संख्या

गणना:

32 छात्रों के वजन का योग = 18.5 × 32 = 592

4 छात्रों के चले जाने पर वजन का योग = 15.5 × 28 = 434

अंतर = 592 - 434 = 158

अभीष्ट औसत = 158/4 = 39.5

∴ सही उत्तर 39.5 है।

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