I feel like I've seen a lot of numbers in the 30-50 range. Thats where i am. In my opinion that's even excessive, but to be honest, being a premed can often be so freaking lame with experiences, and with little cool experience comes a more difficult time when trying to write passionately while showing experiences in things like your personal statement and primary application. Shadow till you accumulate good experiences and see some stuff that tugs at you and makes you cringe or drops your BP a little (just examples) so that when the time comes for you to have to write in a way that needs to convey passion associated with experiences, you can.
"I've see some things man, and some stuff. I wouldn't recommend it!" - actually I would recommend it, just a fun quote.
And you can't show anyone you're certain. You can't even yourself be certain. Your goal is to become as confident as you can, 99.9999% sure, which comes a lot through innate drive and is proven through experiences so that you can try and convince an admin you're legit.