Here you could see all the different relationships that can be obtained by my one formula RV Sigma ; g(x)
Notice the value of " k " which is the area of RV Sigma from 0 to .851 which gives the equivalent area for 1 Std. of the normal curve.
" k " is then divided by Sigma in order to obtain the normal probabilities.

Equivalent areas between my function and the Normal function enable me to obtain normal probabilities using my formula RV Sigma only.