Customers arrive at a single self-serve coffee machine in a busy mall at the rate of 20 per hour, following Poisson distribution. Each customer takes exactly 90 seconds to get his or her coffee. What is the expected number of customers in queue at this coffee machine?

IMMEDIATE PREDECESSORS	TIMES (DAYS)
	ACTIVITY	a	m	b
A		1	4	7
B		2	6	13
C	A	1	1	4
D	A	2	3	4
E	B	2	4	6
F	C,D	1	5	9
G	D,E	1	2	9
H	F,G	3	6	9

b. What is the critical path?

multiple choice

• A-D-F-H

• A-D-G-H

• B-E-G-H

• A-C-F-H

c. What is the expected project completion time? (Do not round intermediate calculations. Round your answer to 3 decimal places.)