During a violent thunderstorm with very high wind gusts in the third week of March, the broadcast tower for the public radio station, WVPR, atop Poor Mountain in Roanoke, Virginia, collapsed. This greatly reduced the strength of the station€™s signal in the area. The station management immediately began plans to construct a new tower. Following is a list of the required activities for building the new tower with most likely (m), optimistic (a), and pessimistic (b) time estimates (in days). However, the sequence of the activities has not been designated.

Using your best judgment, develop a CPM/PERT network for this project and determine the expected project completion time. Also determine the probability that the station signal will be back at full strength within threemonths.

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Time Estimates (Weeks) Activity a Removal of debris b Survey new tower site c Procure structural steel d Procure electrical/ 12 15 18 30 32 broadcasting equipment e Grade tower site f Pour concrete footings f Pour concrete footings 0 18 22 gDeliver and unload steel3 broadcast equipment j Connect electrical cables 4 k Construct storm drains 0 and anchors h Deliver and unload electrical Erect tower 1 25 35 50 10 between tower and building 21 and tiles ackfill and grade tower site 4 6 10 m Clean up n Obtain inspection approval 1