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Mathematics

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eight values have a mean of 7. a ninth value is added. the new mean is 9. what is the new value

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Answer:

25 because the 8 values must times with 7 and will get 56. when the ninth value added , let the ninth value as y , 56+y , the new mean is 9 . so it will be like this , 56+y over 9 times with 9

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