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 = (score-mean)/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

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