State three conditions that must be satisfied for a situation to be modelled by a binomial distribution.
On any day, there is a probability of 0.3 that Julie's train is late.
Nine days are chosen at random. Find the probability that Julie's train is late on more than 7 days or fewer than 2 days.
90 days are chosen at random. Find the probability that Julie's train is late on more than 35 days or fewer than 27 days.