Q4: Consider the following table summarizing the details of a project Activity Predecessor(s) Duration (weeks) Most likely time Pessimistic time 8. Optimistic time A 3 6. 9. 4. 4. 5. 6. 3 3. 9. 4. 11 8. C,D C,D.E F 9. 6. H 3. 9. (a) Construct the project network. (b) Find the expected duration and variance of each activity. (c) Find the critical path and the expected projeet completion time. (d) What is the probability of completing the project on or before 30 weeks'? (e) If the probability of completing the project is 0.85-090 find the expected project completion time.

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Asphalt Binders and Mixtures

Asphalt binders are subsidiary products procured during the refining process of petroleum while manufacturing gasoline, diesel, and similar petroleum products. Asphalt binders are obtained from the residue that remains after the distillation of petroleum, this residue is further subjected to steam distillation and oxidation to remove the traces of gas oil present in the residue. Certain additives or modifiers are also added to asphalt binders to alter them to suit different applications.