Consider the following project network. Time estimates are in weeks. Activity ES EF LS LF Slack Duration 2 B 4 5 LO D 4 E 6 F 7 Saved Question 20 (5 points) -...or the critical path activities are Question 20 (5 points) Saved In the previous project network, the critical path activities are: a) A, B, and C. b) A, B, C, D, and F. c) A, B, D, and F. d) B, C, D, and F. 5 Question 21 (5 points) Saved The LF time for activity A is: 18 a) 2 21 b) 6 24 c) 11 A.Dr. Question 22 (5 points) Saved The ES time for activity Dis: 3 O a) 2 6 --- Ob) 6 C) 11 12 d) 15 15 Question 23 (5 points) 18 0 The total completion time for the project is 00> a) 18 21 b) 22 24 c) 24 d) 28 Which one of the following statements about Project Evaluation and Review Technique (PERT) is TRUE? a) The expected time is given and not computed using formulas. b) The probability of completing the project on time is when the project target completion time equals the expected time. O c) The normal probability distribution is not used in PERT methods. d) The variance in project duration is given by the sum of the variances of the critical path activities. Question 25 (5 points) Saved The county government has decided to redo the street and plans to block the street off which causes considerable inconvenience to people. The project has three parallel paths defined as follows: (i) path A-B-C-H to install street lights and electric wiring that takes 16 days, (ii) path A-D-E-H to install sidewalks with handicap capabilities that takes 22 days, and (iii) path A-F-G-H to repave the street including storm drains that takes 30 days. Which one of the following statements is TRUE? a) The expected duration of the project is 30 + 22 + 16 = 68 days