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Normal Distribution of Data

A normal distribution of data means that most of the elements in a data set are close to the “average.”  Very few examples tend to one extreme or the other.

If you look at a graph of a normal distribution of data it would look like a “bell curve” similar to the one below.

         

The horizontal axis (the x-axis) is the value being analyzed.  The vertical axis (the y-axis) is the number of data points for each value on the horizontal axis.