MandysNotes

Friday, 22 January 2010 20:51

Calculating a Z-Score

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Sometimes we need a standardized scale to measure a value's distance from the center. 

A Z-score indicates how many STANDARD DEVIATIONS a value is from the mean. 

 

The official formula is:

 

So let's say the MEAN is 100 and the Standard Deviation is 15. 

 

If you are given a value of 132, you just plug that into the formula above. 

132 - 100 = 32

32 / 15 = 2.133 

 

VOILA - Your Z-Score is 2.133

 

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