Im now stuck on part (iii) of this question.
On part (i) i found:
Im pretty sure these are right, and just check me on that if you can.
For part (ii), i just explained about there being a set time frame and a fixed average number of events per time frame, which i think is something to do with it.
I'm now really stuck on part (iii). I've got a couple of ideas which i think would give the right idea, but im still pretty unsure.