Problem 17-7

Three recent college graduates have formed a partnership and have opened an advertising firm. Their first project consists of activities listed in the following table. UseTable B.

		TIME IN DAYS
Activity	Immediate Predecessor	Optimistic	Most Likely	Pessimistic
A		5	6	7
B		8	8	11
C	A	6	8	11
D		9	12	15
E	C	5	6	9
F	D	5	6	7
G	F	2	3	7
H	B	4	4	5
I	H	5	7	8
End	E, G, I

b.	What is the probability that the project can be completed in 24 days or less? In 21 days or less?(Round your teand z values to 2 decimal places and "Standard deviation" to 3 decimal places. Round your final answers to 4 decimal places.)

Days	Probability
24 days or less
21 days or less

c.

Suppose it is now the end of the seventh day and that activities A and B have been completed while activity D is 50 percent completed. Time estimates for the completion of activity D are 5, 6, and 7. Activities C and H are ready to begin. Determine the probability of finishing the project by day 24 and the probability of finishing by day 21.(Round your intermediate calculations to 3 decimal places and final answers to 4 decimal places.)

	Probability
Day 24
Day 21