What proportion of a normal distribution is located between z = -0.25 and z = +0.25?

Which of the following biopsychosocial factors is least likely to be related to personality disorders?

a. Stress reactivity b. History of abuse c. Decreased activity of the frontal lobes d. Enjoyment of pain

Which of the following is NOT one of the attributes of learned helplessness?

a. Passivity becoming characteristic behavior. b. Fatigue and isolation making helplessness worse. c. A feeling of lack of control in one situation is generalized to other situations. d. Refusal to give in to demands.