Exploring the Tails of the Normal Distribution
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This Demonstration allows you to estimate the area under the tails of the normal distribution curve. Reading the value of the cumulative distribution function (orange curve) for a specific 
value gives the area under the probability distribution function (blue curve) to the left (for the lower tail) or to the right (upper tail) of the 
value. The probability distribution function can be adjusted to have values for the mean 
and standard deviation 
in the ranges (-10, 10) and (0.1, 15), respectively.
Contributed by: Joe O'Hara (September 2007)
Open content licensed under CC BY-NC-SA
Details
In the "full distribution" view, the plotted range is set at 
. This range can be expanded or compressed by using the bottom slider. In the "lower tail" view, the plotted range is set at (
, 
) to give a view of the tail beyond the typically viewed 
point. Similarly, for the "upper tail" view, the plotted range is set at (
, 
). The ranges in these tail views can also be expanded or compressed to home in on the portions of the curves of interest.
Snapshots
Permanent Citation
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