This image was acquired from
wikimedia. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
Normal Distribution PDF.svg selection of Normal Distribution Probability Density Functions PDFs Both the mean and variance are varied The key is given on the graph selfmade Mathematica Inkscape Inductiveload other fields Mathematica Code Plot PDFNormalDistribution Sqrt PDFNormalDistribution PDFNormalDistribution Sqrt PlotRange