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

Answer 1

Z = (score-mean)/SD

SD^2 = variance

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Answer 2

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