Four buses carrying 156 high school students arrive to Montreal. The buses carry, respectively, 39, 48, 28, and 41 students. One of the students is...

Four buses carrying 156 high school students arrive to Montreal. The buses carry, respectively, 39, 48, 28, and 41 students. One of the students is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the 4 bus drivers is also randomly selected. Let Y denote the number of students on his bus. Compute the expectations of X and Y:E(X)=