9 outs and 37 non-outs is for figuring out the odds of hitting after the turn.
Also odds are usually expressed in the form (chance of happening)
chance of not happening). So saying something happens 1-time-in-5 is the same as saying the odds are 4-to-1 against.
I haven't read ToP in a while, so I'm not sure of how well it explains how to do the math, but if you need help with such things I would recommend "Getting the Best of It" also by Sklansky.