Normal Curve without Sigma in Denomenator
I found out that the Standard Deviation is also equal too: f(x) Blue
which is the Normal Curve without Sigma in the Denominator!!
Notice f(x) equation in Blue
Probabilities are found by Integrating f(x) from 1 to 2 and then dividing by the Standard Deviation ; f(x) / Std.
See what happen now above