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• 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? Answer: A. 17.3 Answer: (A) 17.3 Wrong sum = 10 × 20 = 200. Correct sum = 200 − 52 + 25 = 173. Correct mean = 173/10 = 17.3 . Statistics 1 answer