In a Finite class, 87% of students had perfect attendance at the time of the first exam. Of the students with perfect attendance, 58% earned a B or higher on the first exam. Overall, 44% of students in the class earned a B or higher on the first exam. Consider randomly selecting a student from the class. Are "perfect attendance" and "earned an B or higher on the first exam" independent events? Justify your answer mathematically using definition of independent events