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?

Question

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?

PsyDAG · Answer

Z = (score-mean)/SD -1.3 = (12.2-20)/SD Solve for the SD.

Jane · Answer

10.14