Question

Problem 9-14 Given the following activity times in months, determine the items listed below: Time Estimates (months) Activity Activity Predecessor а т 4 12 A B 6 10 15 С 2 10 14 1 D A 4 13 E A 3 F В 3 6 18 G 2 8 12 Н С.Е.F С.Е.F 15 22 I 5 12 21 J D 20 25 K G.I 5 12 L Н.К 3 20 Expected activity times b. Variance times а. c. Earliest start d. Earliest finish e. Latest start f. Latest finish g. Slack times h. Critical path i. Expected project duration and the standard deviation

Answer 1

Answer a, b, c and d

				Answer a	Answer b	Answer c	Answer d
Activity	Optimistic time-a	Expected completion time-m	Pessimistic time-b	Expected time= (a+4*m+ b)/6	Variance, (sigma)^2= (b-a/6)^2	Earliest start= Max[earliest finish of preceding activity]	Earliest finish= Earliest start + expected time
A	4	8	12	8.00	1.78	0	8.00
B	6	10	15	10.17	2.25	0	10.17
C	2	10	14	9.33	4.00	0	9.33
D	1	4	13	5.00	4.00	8.00	13.00
E	3	6	9	6.00	1.00	8.00	14.00
F	3	6	18	7.50	6.25	10.17	17.67
G	2	8	12	7.67	2.78	9.33	17.00
H	9	15	22	15.17	4.69	17.67	32.83
I	5	12	21	12.33	7.11	17.67	30.00
J	7	20	25	18.67	9.00	13.00	31.67
K	5	6	12	6.83	1.36	30.00	36.83
L	3	8	20	9.17	8.03	36.83	46.00

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