Problem 13-13 (Algorithmic)

Suppose that the following estimates of activity times (in weeks) were provided for the network shown below:

Activity	Optimistic	Most Probable	Pessimistic
A	5	6	7
B	3.5	4	4.5
C	6	7	8
D	5	6	9
E	6.5	8	9
F	2	3	4
G	8	9	12
H	6	7	12

What is the probability that the project will be completed. If required, round your answers to four decimal places.

Within 21 weeks?

Within 23 weeks?

Within 25 weeks?