Posted by Jen on Wednesday, October 12, 2011 at 6:28pm.
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

Help plz!! Math....  PsyDAG, Thursday, October 13, 2011 at 11:47am
Z = (scoremean)/SD
SD^2 = variance
Please only post your questions once. Repeating posts will not get a quicker response. In addition, it wastes our time looking over reposts that have already been answered in another post. Thank you. 
Help plz!! Math....  Jennifer, Thursday, October 13, 2011 at 12:50pm
I apologize...thank you....so is it
A data point of 20 is one standard deviation above the mean of 15, so the standard or "z" score is 1.0