solve question number 1 , question no 4 is wrongly uploaded

Q.4 Construct an activity on arrow network based on the activity descriptions below. Label all the activities in the network by their activity letters and node numbers. Remove any redundant dependencies and label dummy activities DUMMY1, DUMMY2, etc. The predecessors to Activity Z2 are Activity L, The successors to Activity B are Activities E1, S, W and D2. Activity El also depends on Activity M. Activity U and F follow Activities W and D2, and precede Activities E and RI. Activity Y follows Activities C and R, and followed by Activity L. Activities D, M, and B start the project. Activity C can start when Activities D, El and S are completed. Activity R cannot begin until Activity W is finished. Activity I follows Activity D and precedes Activity L. Activity E follows Activities C and R. Q. 1 James Robinson president of ABC Corporation has identified tasks, their durations, and predecessor relationships as shown in the following table for building new motels. Develop the AON network and answer the following Marks 30 Predecessor 26 Activity A B D E F G H I J K 4 1 A A B E, C E, C F F D, G, H I, J (CLO 3: Application, PLO: Project Management) Time Estimates in Weeks Optimistic Most Likely Pessimistic 4 8 12 2 8 8 12 16 6 12 2 3 8 22 2 3 6 2 2 2 6 6 6 6 12 2 2 6 a) Compute the Variance for activity C? b) Discover critical path and its duration? c) Determine the activities variance along critical path? d) Determine the probability that the project would complete before week 36