Like the other guys said, it depends on your standards and the type of shooting you are doing...For instance,
"This wasn't meant to be a very technical question as I go out and take photos of different things I adjust for every shot to where I think I need to be. About one out of 20 shots I am happy with the way the focus white balance and lighting turned out."
Since I shoot RAW, I can set white balance later so I will never have a throwaway because of white balance. For lighting, that's kind of a strange one, also, since I might take several test shots to set up my lighting. I will also probably take a shot of a calibration target to help me fine tune things in post processing, so none of those shots are 'keepers'. As far as actually taking shots, I would say 95% of my shots have adequate lighting and good focus(and out of those, it is usually because I didn't let my flash recycle long enough). So, if that is the criteria, my keeper ratio would be quite high.
Unfortunately, I have to count people blinking, being a second late to a 'moment' I wanted, a hand in front of a face, a hand or foot chopped off, etc. So, I probably delete 10-20% of my photos in camera, will probably have at least 4 to 5 of each shot that are similar enough where I will only process one of them, and out of the ones I process, I will post most of them, but may only print a couple...So, out of a 60 photos, I'll probably process 10 of them and maybe print one or two.