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ANATOMY OF A Z-SCORE
A z-score is a measure of distance from a standardized value to the mean of the Standard Normal Distribution, a special distribution with a mean equal to 0,
and a standard deviation equal to 1.
The units marked on the horizontal axis of the Standard Normal Distribution are called Z-Scores (or Z-Values). A specific value of z gives the distance
between the mean and the point represented by z, in terms of the standard deviation.
A z-score of -2
corresponds to the point that is two
standard deviations to the left
of 
A z-score of 3
corresponds to the point that is
three standard deviations to the right
of 
z-score
-3
-2
-1
  3   2    
0
1
2
3
     2   3
REMEMBER… a z-score can be negative (to the left of the mean), or
positive (to the right of the mean). Areas/probabilities are NEVER negative.