I wouldn't be helping much since somedude and i share the same answers. Lets say there are Y people.

1)If they have an equal chance of getting off the answer to this would simply be anywhere from 0 to Y(sidenote: if i said between 0 and Y that would not include 0 and Y).

2)I thought when you kind of answered the question in the information given since they have an equal chance so everything would have a

chance since theres an equal probability.

3)straight-forward

this is because if theres an equal chance we would expect equal people to get off at each floor and since there are Y people the answer was

.