Using the following information, what is the joint probability for the three paths to be completed in 25 days or less while recognizing that in practice it is possible for noncritical paths to take longer than expected?

a.

0.0419

b.

0.5000

c.

0.3311

d.

some other value

e.

0.0000

Path Path Path Duration Standard Deviation 1-2-5-7 24 days 2.236 days 1-3-7 22 days 1.414 days 1-4-6-7 25 days 2.000 days