@Test
public void calcTotalAttendanceRate() throws Exception {
Member member = new Member();
Study study1 = new Study();
Meeting meeting1 = new Meeting();
Meeting meeting2 = new Meeting();
Meeting meeting3 = new Meeting();
Study study2 = new Study();
study1.addMeeting(meeting1);
study1.addMeeting(meeting2);
study2.addMeeting(meeting3);
member.addJoinedStudy(study1);
member.addJoinedStudy(study2);
member.applyAttendance(meeting1);
member.applyAttendance(