Rex did poorly on his biology exam and blames his teacher. He does not feel like she prepared him for the exam, even though he went out the night before the exam to a party, and didn't finish reading the chapters. After taking the test, he complained to his classmate that the test was unfair. Rex believes that chance, luck, and the behavior of others control his life. According to Rotter, Rex has a(n) ________ locus of control.