About 30% of adults say that reading is a favorite leisure activity. Let success be the outcome that reading is a favorite leisure. Find the probabilty that:
a) More than 5 trials are needed in order to obtain 3 successes. (Hint: In other words, the event is at most 2 successes in 5 trials)
b) More than 9 trials are needed in order to obtain 5 successes.