Poisson Distribution

[outer bluff]

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