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Use this page to visualize the standard normally distributed pdf and to find, approximately, what is the area under the curve between any two points.

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The normal distribution is given by the following pdf:  `frac{1}{sigma sqrt{2 pi}}e^{frac{-1}{2} (frac{x- mu}{sigma})^2}`

The standard normal distribution is given by the following pdf:  `frac{1}{sqrt{2 pi}}e^{frac{-1}{2}x^2}`

The standard normal distribution has mean `mu=0` and standard deviation `sigma=1`.