The mean of 10 observations was found to be 20. Later it was noticed that one observation, 25, had been wrongly copied as 52. What is the correct mean?
A. 17.3
B. 18.5
C. 22.7
D. 19.7
1 answer
Best answer
Answer: A. 17.3
Answer: (A) 17.3
Wrong sum = 10 × 20 = 200. Correct sum = 200 − 52 + 25 = 173.
Correct mean \(= \frac{173}{10} = 17.3\).
Doubtly AI
· 27 Oct 2026
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