I suspect that that actually is the case, but if you were allowed to be operating in a mastery framework, if you were allowed to really take agency over your learning, and when you get something wrong, embrace it -- view that failure as a moment of learning -- that number, the percent that could really master calculus or understand organic chemistry, is actually a lot closer to 100 percent.
Pretpostavljam kako je upravo to na stvari, ali ako bi vam bilo dopušteno  operirati po poretku ovladavanja, ako bi vam bilo dopušteno zbilja upravljati nad svojim učenjem, te kad nešto shvatite krivo, to i prihvatite -- vidite taj promašaj kao trenutak učenja -- taj broj, postotak koji bi zbilja mogao ovladati kalkulusom ili razumijeti organsku kemiju, je zapravo puno bliži 100 posto.