Help plz!! Math....
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

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. 
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