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The mean is 18.1

The z-score for 13.0 is - 1.7.
What is the standard deviation for this data set.

2 answers

Z = (score-mean)/SD

-1.7 = (13-18.1)/SD
-1.7 = -5.1/SD
-1.7SD = -5.1
SD = -5.1/-1.7
SD = 3.0

z-score = (given value - mean)/sd
-1.7 = (13 - 18.1)/sd
-1.7sd = -5.1
sd = -5.1/-1.7 = 3

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