Each of the 300 students at a high school takes the same four courses. Three of the

Question:

Each of the 300 students at a high school takes the same four courses. Three of the courses are each taught in 15 classes of 20 students each. The fourth course is taught in 3 classes of 100 students each. Find the mean class size experienced by each student. Find the mean class size in the 48 courses. Are the two means the same?