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This question says: Statistical information for a data set is given.

-the mean is 18.1
-the z-score for 13.0 is -1.7
What is the standard deviation of this set?

1 answer

Z = (score-mean)/SD

-1.7 = (13-18.1)/SD

-1.7SD = 13 - 18.1

Solve for SD.
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