Only C & D please!

Consider the following network diagram

Below are the activity time estimates, in months.

Activity	Optimistic	Most likely	Pessimistic
A	2	5	11
B	3	3	7
C	1	3	5
D	6	8	10
E	4	7	10

What is the expected duration of the activity A?

5.5 months

b. Refer to the network diagram in the previous question. What is the standard deviation of the duration of the path B-C-D?

2 months

c. What is the probability that the path A-D will be completed within 15 months?

		0.1804
		0.7111
		0.7556
		0.82
		0.9138
		Another value

Only C & D needed!

d. What is the probability that the project will be completed within 15 months? Assume that the path durations are independent of each other (though they are not), just like we did in the lecture.

		0.36
		0.3658
		0.4613
		0.5628
		0.6136
		Another value

Consider the following network diagram A E E B D