The mean of 8 observations is 15. If one observation, 23, is removed, what is the mean of the remaining observations?

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• A 13 + 6/7
• B 14 + 1/7
• C 13
• D 14

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Answer: A. 13 + 6/7

If the average of 8 observations is 15, the total mark is 120. 120-23=97 97 divided by 7 = 13 + 6/7

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