For Exercise 13.11, a hospital
is planning to add a $60 million patient tower. In order to support both
the exisiting hospital facility and the new patient tower, an existing energy
plant will be expanded and upgraded. Equipment upgrades include a new
generator, liquid oxygen tanks, cooling towers, boilers, and a chiller system
to ensure adequate electricity, heating, air conditioning, hot water, and
oxygen delivery systems. Existing fuel tanks will be relocated. The
activities, their immediate predecessors, and the optimistic, most likely, and
pessimistic times in weeks for this project are listed in Table EX 13.11:
a. Calculate the mean duration time
for each activity.
b. Calculate the variance for each
activity time.
c. Identify the mean and the
standard deviation for each path.
d. Calculate project completion
probability for 147, 150, and 152 weeks.
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