4 In summer, wasps' nests occur randomly in the south of England at an average rate of 3 nests for every 500 houses.
- Find the probability that two villages in the south of England, with 600 houses and 700 houses, have a total of exactly 3 wasps' nests.
- Use a suitable approximation to estimate the probability of there being fewer than 369 wasps' nests in a town with 64000 houses.