5 Every day Richard takes a flight between Astan and Bejin. On any day, the probability that the flight arrives early is 0.15 , the probability that it arrives on time is 0.55 and the probability that it arrives late is 0.3 .
- Find the probability that on each of 3 randomly chosen days, Richard's flight does not arrive late.
- Find the probability that for 9 randomly chosen days, Richard's flight arrives early at least 3 times.
- 60 days are chosen at random.
Use an approximation to find the probability that Richard's flight arrives early at least 12 times.