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Một sinh viên thi hết học phần, gọi:X = "Sinh viên đạt điểm tối đa"Y = "Điểm số của sinh viên"Z = "Số câu làm đúng của sinh viên"W = "Số câu làm sai của sinh viên"Khái niệm nào KHÔNG phải là biến ngẫu nhiên?

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