Four Buses Carrying 165 High School Students Arrive To Montreal The Buses Carry

Four buses carrying 165 high school students arrive to Montreal. The buses carry, respectively, 38, 44, 33, and 50 students. One of the studetns 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 and variances of X and Y: