Imagine that you recently took a statistics exam and your instructor just returned your graded exam. The instructor announces that 75% of students
scored below the mean. How do you reconcile this with the fact that, in a normal distribution, half of the scores should fall below the mean, a
of the scores should fall above the mean?
Why can we NOT assume that for any scale variable, 50% of cases are above the mean and 50% are below the mean?