The normal distribution describes a symmetrical plot of data around its mean value, where the width of the curve is defined by the standard deviation. It is visually depicted as the "bell curve." ...

would be considered long-tail data points that consequently lie squarely outside of the three-standard-deviation range. Bell Curve vs. Non-Normal Distributions The normal probability distribution ...

This applet allows users to drag sliders to change the mean and standard deviation of the normal distribution. The applet shows how changing these two values determines the shape and spread of the ...