hi, can you help me with my probability and stats assignment, I need it ASAP. Thanks a lot, ur help would be rlly appreciated :).

Q4. What is the probability that the 7th head is observed on the 12th independent flip of a fair coin? 792 7 A. D. 4096 4096 231 E. 7 B. 4096 12 231 C. F. None of A-E are correct. 2048 Q5. Given Mx(t) = e3(et-1), find the value of E[X(X - 1)]. A. 1 D. 9 B. 3 E. 12 C. 6 F. None of A-E are correct. Q6. Suppose the c.d.f. of X is given by: 0 if * 4 What is the value of SD(X)? A. 0.9428 D. 1.75 B. 1.6 E. 2.8 C. 1.5556 F. None of A-E are correct.Q7. From the five given diagrams below select the diagram that shows a valid c.d.f. for a discrete random variable. (i) F(x) 0.5 + 3 (ii) F(I) 0.5 (iii) F(I) 0.5 + (iv) F(I) 0.5 (v) F(I) 1 0.5 I A. (i) D. (iv) B. (ii) E. (v) C. (iii) F. None of A-E are correct