7. Let Z N (O, 1). Which of the following is true? P(IZI < 1) - < Z < 1)]. P(VI < 1) = 2[0.5 - < P(VI < 1) = 0.5 +2P(0 < z < 1). 8. Let X be a continuous random variable such that E(X) following MUST be true? > 12) = > 1210) = P(Z > 2) > 12) < 2 12) > 12) = < 8) > 12) 2 > 13) = 10 and var(X) - [3 marks] 1, which of the [3 marks]