Activity Description                        Activity Predecessor       Activity   Duration (weeks)

a            Excavate                                                      ---                                2

b             Erect building                                                   a                           6

c            Install generator                                                a                            4

d             Install tank                                                       a

e           Install maintenance equipment

f            Connect generator and tank to                     b, c, d                        5

              building

g              Paint on a finish                                           b                               3

h            Check out facility                                           e. f                          2

Construct the network for this project. Identify the critical path, and determine the project duration time.

Given the following network (in the opposite column) and probabilistic activity time estimates. Determine the expected time and variance for each activity and indicate the critical path: