fi. Determine the critical activities and the minimum duration of the project . [3 ] iii. Further study of the dam construction project revealed some uncertainty in the estimates of the durations of activities a and b. Duration of all other activities are certain , therefore their mean durations are the same as those in Table 4 with having a variance of zero (0). The time estimates for activities a and b are shown in Table 5: Table 5 Activity Optimistic Time Most Likely Time Pessimistic Time (days ) (days ) (days ) a 24 27 30 Using PERT determine the mean duration of activities a and b and the new minimum duration of the project . Find the probability of completing the project in 75 days . [6] Question 5 A survey was conducted on the operations at an electric cable manufacturing company to assess the inefficiency of five supervisors , given their record of performance at four production sections in the past . The levels of inefficiency were assessed by the metres of cable rendered defective in a week's operation of each section . Table 4 is a summary of e survey showing the level of inefficiency (defective metres of cable ) of each supervisor at the four working sections Table 6 Section Supervisor 2 A 18 B 13 13 6 C 18 11 15 12 D 10 12 23 19 F 12 8 10 15