1. Four buses carrying 100 students from the same school arrive at a football stadium. The busse= carry, respectively, 10, 20, 30, and 40 students. One of the 100 students is randomly selected anc let X denote the number of students on the bus carrying the randomly selected student. Let Y denote the number of students when one of the 4 buses is randomly selected. (a) Explain (without any computation) which of E[X] or E[Y] you think is larger? Why?