Stats
posted by Jen .
A set of 50 data values has a mean of 15 and a variance of 25. Find the standard score of a data value = 20.
I'm not sure how to do this....please help

Stats 
PsyDAG
Z is a standard score in terms of standard deviations from the mean.
Z = (scoremean)/SD
SD^2 = Variance
Calculate SD and insert values into equation above.
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