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Statistic question

mean of first 7 observation is 18 and the mean of last 7 observations is 20. find the 7th observation if the mean of all 13 observations is 19.
Question asked by: chetna87

Asked on: 15 Jan 2010
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Good question!

I'm not sure how to tackle this question as there are two sets of seven observations but then only 13 in total and not 14 observations, so is there one that overlaps in the middle the way the question is written?

By: knowitall
Replied at: 17 Jan 2010
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