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Introduction to Statistics

Mean of eight...

Question

Mean of eight observation is 25 if one observation 11 is excluded, find the mean of the remaining

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Solution

If the mean of 8 observations is 25, its total is 25 * 8 = 200.

If the observation 11 is excluded, then the total of 7 observations will be 200 - 11 = 189.

Therefore, the mean of 7 observations with a total of 181 is 189/7 = 27

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