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> Question 4 (25 marks) (a) The activities involved in an Aero-engine assembly project are given below in Table 4.1. Apply the activity-on-arrow methodology to determine: (i) The critical path network diagram for this project. (8 marks) (ii) The critical path(s). (2 marks) (iii) The project completion time. (2 marks) (iv) The slack time for all non-critical activities. (7 marks) Table 4.1 Activity Immediate Duration predecessors (days) The Main Frame Body A IS A B B B 10 F 3 GU D, E, H 1 2 The Main Engine K 10 K M LO 5 N MU B D E F G H 1 J -wu wou JZOAO Senen -- N,P,Q R 10 & General activities T U T V JS (b) Briefly discuss the application of Standard Deviation in the project management. With reference to part (a), assuming the standard deviation of all the activities is 1 day, what will be the probability of the project completion day is 45 days? (6 marks) Rubrics and Marking: Totally 25 marks, and the marks for each sub-question are shown after the question. Marks will be given by the ability to apply methods for project scheduling