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 The sum of 15 observation is 343 . If we remove two observation 18 and 26 , then find out the mean of remaining observations. [ Calculator, Method and examples ]Solution:Your problem -> The sum of 15 observation is 343 . If we remove two observation 18 and 26 , then find out the mean of remaining observations.Here Sigma(X) = 343 and n = 15If we remove two observation then 13 observation left. Sum of 13 observation Sigma(X') = 343 - (18 + 26 ) = 351Then the mean of remaining 13 observations = (Sigma X') / n = 351/13 = 27 .

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