statistics

There are three TAs at STAT class Office hours: Tom, Jackey, and Jackson. Two students arrive at office hours at different times when the TAs are helping no other students. It is assumed that the students then approach a TA for help at random and independently of one another. Let X and Y be defined as follows: X = # of times Jackey is asked for help Y = # of times Jackson is asked for help 1. Find the expected number of students that will ask Jackey for help. 2. Find the expected number of students that will ask Jackson for help