By rewriting the formula for the multiplication​ rule, you can write a formula for finding conditional probabilities. the conditional probability of event b​ occurring, given that event a has​ occurred, is upper p left parenthesis upper b vertical line upper a right parenthesis equals startfraction upper p left parenthesis upper a and upper b right parenthesis over upper p left parenthesis upper a right parenthesis endfraction . use the information below to find the probability that a flight departed on time given that it arrives on time. the probability that an airplane flight departs on time is 0.89. the probability that a flight arrives on time is 0.86. the probability that a flight departs and arrives on time is 0.83.