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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.

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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 = 15`

If we remove two observation then `13` observation left.

Sum of `13` observation `Sigma(X') = 343 - (18 + 26 ) = 351`

Then the mean of remaining `13` observations = `(Sigma X') / n = 351/13 = 27` .






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