SSC GD Constable previous year question
The average of 28 observations is 53. The average of the first 11 observations is 54. The average of the last 18 observations is 52.5. What is the value of the 11th observation?
Asked in SSC GD Constable 2024: 26 Feb 2024 Shift 1 · Quantitative Aptitude
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Correct answer: (A) 55
Total of 28 = 1,484. First 11 sum=594, last 18 sum=945. The 11th observation (double-counted) = 594+945−1,484 = 55.
हिंदी में प्रश्न
28 प्रेक्षणों का औसत 53 है। प्रथम 11 प्रेक्षणों का औसत 54 है। अंतिम 18 प्रेक्षणों का औसत 52.5 है। 11वें प्रेक्षण का मान कितना है?
उत्तर जाँचने के लिए किसी विकल्प पर टैप करें।
उत्तर और व्याख्या देखें
सही उत्तर: (A) 63
Total of 28 = 1,484. First 11 sum=594, last 18 sum=945. The 11th observation (double-counted) = 594+945−1,484 = 55.
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