5) The optimistic, most probable, and pessimistic time estimates for the activities of the airline's between-flight operation (in minutes) are as follows: Activity A Optimistic (a) Most Probable (m) Pessimistic (b) 1 2 3 4 C 2 5 8 D 7 10 13 E 3 4 5 F 5 7 9. G 7 10 13 8. 6. H. 5 11 I 4 8 J 7 10 13 K 8 9. 10 L 8 10 12 M 9. 11 13 i) Calculate the expected duration, the variance and determine the critical path of the project. (5 marks) ii) What is the probability of the project completed on time if the project is given a 55-minute deadline? (2 marks)