Details of a PERT/CPM problem is listed in the table below. Times are given in weeks. Activity Preceding Optimistic Time Probable Time Pessimistic Time A -- 7 9 14 B A 2 2 8 C A 8 12 16 D A 3 5 10 E B 4 6 8 F B 6 8 10 G C, F 2 3 4 H D 2 2 8 I H 6 8 16 J G, I 4 6 14 K E, J 2 2 5 a.​Calculate the expected time & variance for each activity. Enter these values in the appropriate column in the table above. {10 Marks} b. ​Which activities form the critical path? {3 Marks} c. ​What is the estimated time of the critical path? {3 Marks} d. ​What are the project variance and the project standard deviation? {4 Marks} e. ​What is the probability of completion of the project after week 40? {5 Marks}

Atown located beside a river derives a large percentage of its revenues each year from the local logging industry. however, heavy traffic to and from the logging sites has increased pollution and contributed to soil erosion. this has also resulted in the loss of native bird species in the logged forests. which of the following is the most sustainable solution to this problem? protecting certain forested areas to allow the birds to recover relocating the equipment and vehicles to new forests for logging relocating the birds to new forests away from the town introducing new bird species to replace the species that have been lost reducing the number of trucks traveling through the forest by 10 percent