



 
Imogen Don't think of it as 50+10+10, think of it as 50 + (10 * 2.0) Then find 50 + (10*1.27), etc. Good Hunting! PS: I notice that one of the three Zscores you give is the sum of the other two. This may just be a coincidence. If however they are actually {1.27,0.47,0.80}, their mean is exactly 0 [suggesting Z scores based on a sample mean, which would be unusual for a small sample like this] but their standard deviation is not 1. Better check what you did.
 


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