garym wrote: > Hmmm, so a Bernoulli trial where one could calculate the overall > probability of guessing independently on each question in an 'N' item > exam where the probability of a correct pure guess being .25 for each > trial (4 options) as compared to guessing "C" on all N items. But then > I guess it gets messy because I'd have to make some assumptions about > the distribution of "C" as correct answer across the the N items (which > is your point about what professors tend to choose). I need more > coffee. ;-)
So with 10 questions, .25 prob of getting any question correct (four possible answers, pure guessing), I'd have a probability of getting 1 or more correct answers of 0.9437. With 100 questions, the probability of getting 1 or more right is 0.9999. With the critical assumption of at least one question having "C" as the correct answer, if I guess C on each of the 10 (or 100) questions, the probability of getting at least one right is 100%. ------------------------------------------------------------------------ garym's Profile: http://forums.slimdevices.com/member.php?userid=17325 View this thread: http://forums.slimdevices.com/showthread.php?t=98010 _______________________________________________ audiophiles mailing list audiophiles@lists.slimdevices.com http://lists.slimdevices.com/mailman/listinfo/audiophiles
