Statistics

Normal distribution

https://www.maa.org/sites/default/files/pdf/upload_library/22/Allendoerfer/stahl96.pdf

Derivation of the normal distribution from the binomial:

http://people.bath.ac.uk/pam28/Paul_Milewski,_Professor_of_Mathematics,_University_of_Bath/Past_Teaching_files/stirling.pdf

http://www.m-hikari.com/imf/imf-2017/9-12-2017/p/baguiIMF9-12-2017.pdf

http://mathforum.org/library/drmath/view/56600.html