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it means that the score is above the mean
"Three score" means 60. The word "score" in this sense means 20 of something, a usage that was more common in the past than it is now.
A z-score of 0 means the value is the mean.
A score is 20 and three score is 60. Three score cubits means 60 cubits, a measure of length.
It depends entirely on the variance (or standard error).