Generel formel for normalfordelingen er:

(1/sqrt(2*Pi)*sigma)*exp(-0.5*((x-mu)/sigma)^2

Vaelges sigma lig 1 og mu lig 0 faas:

> plot((1/sqrt(2*Pi))*exp(-0.5*(x^2)),x=-10..10);

> int((1/sqrt(2*evalf(Pi)))*exp(-0.5*(x^2)),x=-infinity..infinity);

Vaelges sigma lig 5 og mu lig 2 faas:

> plot((1/sqrt(2*Pi)*5)*exp(-0.5*((x-2)/5)^2),x=-10..14);

> int((1/(sqrt(2*Pi)*5))*exp(-0.5*((x-2)/5)^2), x=0..2);

>

> int((1/(sqrt(2*Pi)*5))*exp(-0.5*((x-2)/5)^2), x=2..5);

> int((1/(sqrt(2*Pi)*5))*exp(-0.5*((x-2)/5)^2), x=2..infinity);

> int((1/(sqrt(2*Pi)*5))*exp(-0.5*((x-2)/5)^2), x=-infinity..infinity);

>