Posted by Jen on .
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.