Question: how to you handle percentage problem?

I found my brain is not good at handle the prefect % plan, compared with computer.

well as computer is easy to handle 75% Raise with 25% check call decision, - to call or to raise
but I am not good at it

so just want to ask, if I have an optimized decision to do 78% Raise, 22% Check... how to do that accurately and randomly in reality?

thanks

apply to both online and live poker situation.

BTW: throwing dice or coin is not random...at least a poor idea for me.