8. A construction project of a campus building consists of six activities (in weeks) as follows.

What is the probability that the project will be completed in21 weeks or earlier? (keep three decimal places during computation if necessary and select the closest answer)

Note: there are another two questions based on the same project, so please keep your work to save time.

Select one:

a.

None of other options.

b.

about 62%

c.

about 43%

d.

about 66%

e.

about 71%

f.

about 75%

9. A construction project of a campus building consists of six activities (in weeks) as follows.

What is the due date (in weeks) that yields a95%chance of completion? (keep three decimal places during computation if necessary and select the closest answer)

Note: there are another two question based on the same project, so please keep your work to save time.

Select one:

a.

None of other options.

b.

about 21.5 weeks

c.

about 22.2 weeks

d.

about 23.0 weeks

e.

about 22.5 weeks

f.

about 23.8 weeks

10. A construction project of a campus building consists of six activities (in weeks) as follows.

What is the probability that the project will be completed in18 weeks or earlier? (keep three decimal places during computation if necessary and select the closest answer)

Note: there are another two questions based on the same project, so please keep your work to save time.

Select one:

a.

about 19%

b.

about 14%

c.

about 27%

d.

about 10%

e.

None of other options.

f.

about 90%

12. The critical path for the project shown below is ________ with duration of ________.

Select one:

a.A-B-D;10

b.A-B-C-D-E; 22

c.

A-B-E; 11

d.C-E; 12

e.A-D-E; 13