4 The 1300 train from Jahor to Keman runs every day. The probability that the train arrives late in Keman is 0.35 .
- For a random sample of 7 days, find the probability that the train arrives late on fewer than 3 days.
A random sample of 142 days is taken. - Use an approximation to find the probability that the train arrives late on more than 40 days.