30 students is divided up into three classes, Class A, Class B, and Class C. There are 4 students in Class A, 10 in Class B, and 16 in Class C. When recess is over, one student out of the entire 30 is randomly chosen to call all the other students back to the classroom. Let X denote the number of students in the Class to which the chosen student belongs. Find E[X]. O 12.4 O 10 O 372 O 15.6