<PRE><B>Question 555336</B>
A data set has nine values. The mean of the set is five. 
Total points was 9*5 = 45
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When a tenth value is added, the mean becomes six. What is the tenth value?
Total points will be 10*6 = 60 points.
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The 10th value must have been 60-45 = 15
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What is the sum of the original nine data values : 45 
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Cheers,
Stan H.
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