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Mean of eight observations is 25. If one observation 11 is excluded, find the mean of the remaining.

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Mean of eight observations is 25. If one observation 11 is excluded, find the mean of the remaining.

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Given that 

The mean of 8 observations = 25 

The sum of 8 observations = 8 × 25 = 200

If the observation 11 is subtracted from the sum ⇒ 200 – 11 = 189 

∴ The mean of remaining 7 observations = 189/7 = 27

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