Asked by Belinda

If the mean of a set of data is 20.00 and 12.20 has a z-score of -1.30, then the standard deviation must be: What formula would you use to determine this?
Answered by PsyDAG
Z = (score-mean)/SD

-1.3 = (12.2-20)/SD

Solve for the SD.
Answered by Jane
10.14
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