Suppose you observe the cumulative GPA of each student for the entire student population of the University of Montreal. This population numbers 45,000 students, of which 6,000 are foreign students and 39,000 are domestic students. (a) Is the cumulative mean expectation for the entire population a random variable? Is the conditional grade point average expectation of the students (i.e., domestic or foreign) a random variable? Briefly justify your answers