a) 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.
b) 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.
c) 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.
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