probability problem
Hello!
I cann't think out this problem.Please help me.ok?
There is a possible stop at every floor(floor 3,floor 2 and floor 1).Assume that any person is likely to get off at any floor and let X be the number of people that get off on the first floor.
(i)What values can X take on?
(ii)Find the probability for each possible value of X.
(iii) What is the expected number of people getting off on the first floor?
