### Image: Standard normal density

The standard normal density function is defined by \begin{gather*} \rho(x) = \frac{1}{\sqrt{2\pi}} e^{-x^2/2}. \end{gather*} Its graph is a bell-shaped curve.

Image file: standard_normal_density.png

Source image file: standard_normal_density.ggb

Source image type: Geogebra

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