Variations of the Normal Distribution
Move the sliders for the mean μ and the standard deviation σ to
see how the normal distribution curve, i.e. the bell curve changes.
The values x = μ + σ and x = μ  σ are where the curvature of the
bell curve changes from down to up. The bell curve curves
downward on interval containing the mean, but it curves upward
outside of this interval.
Updated October 9, 2013
Created by David Gurney using GeoGebra
