1. From the 300 chickens of a farm, 100 have attracted bird flue. If four chickens are randomly selected from the population of 300, what is the probability that all of them have bird flue?
2. Flaws occur at random along the length of a thin copper wire. Suppose that the number of flaws follows a Poisson distribution with a mean of 0.15 flaws per centimetre. What is the probability of more than 2 flaws in a section of length 10 centimetre