if 30% of all students who enter a certain university drop out during or at hte end of their first year, what is the probability that more than 600 of this year's entering class of 1800 will drop out during or at the end of their first year?
the probability is zero percent. 30% of 1800 is 486, and since that number was exact and the final number was less than 600, it is statistically impossible.