Four buses carrying 142 high school students arrive to Montreal. The buses carry, respectively, 30, 50, 25, and 37 students. One of the 142 students is randomly selected. Let X denote the number of students that were on the bus carrying this randomly selected student. One of the four 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: Get Math homework help