Posted by **Jennifer** on Thursday, October 13, 2011 at 9:28am.

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

- statistics -
**drwls**, Thursday, October 13, 2011 at 10:29am
The "standard score" is more commonly called the "z-score".

It is the number of "standard deviations" above the mean.

The standard deviation is the square root of the variance, or 5 in this case.

The number of data values is not needed to answer the question.

A data point of 20 is one standard deviation above the mean of 15, so the standard or "z" score is 1.0

- Can someone help me please? -
**Jennifer**, Thursday, October 13, 2011 at 12:32pm
Statistics confuses me....thank you for your help :)

- Can someone help me please? -
**Anonymous**, Friday, July 13, 2012 at 7:52pm
A z-score is 0.6 standard deviations above the mean.

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