' Problem (9) (8 points) Let X1, X2, X64 be i.i.d. random variables from Normal( = -3, 0 = 25). (a) (1 points) Compute E[-2X2-3X3]. (b) (1 point) Compute E[X]. (c) (1 point) Compute Var[-3X2-2X3]. (d) (1 point) Compute Var[X]. (e) (1 point) Compute X E (f) (1 point) Compute - Var 0/8 (g) (1 point) Compute E (h) (1 point) Compute Var [(87)"] 7. What is the key conceptual difference between distributed and parallel computing? [5 points] a) There is no difference. b) Distributed computing is used mostly for scientific computing. c) Parallel computing uses more units compared to distributed computing. d) Units in parallel computing share memory while units in distributed computing have their own memory. e) Parallel computing uses faster processors compared to distributed computing.