>>9
>"If you walk into a random computer lab..."
trick question. the number of computer labs and the distribution of computers within them must be known.
for instance, assume that there are only 2 computer labs. maybe they put all 46 AMD HPs in one, and the rest in the other. therefore the probability is .5. if they split the 'rest' computer lab into two computer labs, then you'd only have a .333 probability, etc.