Penentuan Jalur Kritis

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KASUS PENENTUAN JALUR KRITIS 3

5

E

G

B

1

2

A

6

D

9

J

10

K

I

C

F

4

KEGIATAN j 2 3 4 6 5 7 6 8 8 9 10

i 1 2 2 2 3 4 5 6 7 8 9

8

H

7

Nama A B C D E F G H I J K

Waktu (hari) Wm Wp 3 5 2 3 4 5 8 10 4 7 6 7 3 4 6 7 6 13 3 10 2 3

Wo 1 1 3 6 1 5 2 5 5 2 1

Wh 3 2 4 8 4 6 3 6 7 4 2

Varian σ2 0.44 0.11 0.11 0.44 1.00 0.11 0.11 0.11 1.78 1.78 0.11 6.11

Jaringan Kerja Waktu rata-rata (Wh) 3

5

E=4

5

7

9

G=3

B=2

1

2

A=3

0 0

3

11

6

D=8 3

9

J=4

20 20

K=2

24 24

10 26 26

I=7

C=4

4 7

Note :

8

H=6

12 14

7

F=6 7

13 13

ES LF

PENENTUAN JALUR KRITIS: i

KEGIATAN j

Nama

Paling Awal Mulai Selesai

Wh

ES

1 2 2 2 3 4 5 6 7 8 9

2 3 4 6 5 7 6 8 8 9 10

A B C D E F G H I J K

3 2 4 8 4 6 3 6 7 4 2

EF (EF + D)

0 3 3 3 5 7 9 12 13 20 24

Paling Akhir Mulai Selesai LS (LF - D)

3 5 7 11 9 13 12 18 20 24 26

JALUR KRITIS : 1 --> 2 --> 4 --> 7 --> 8 --> 9 --> 10 dengan waktu (Y) = 3 + 4 + 6 + 7 + 4 + 2 = 26 hari Probabilitas Pekerjaan selesai lebih dari Y + 2 hari atau lebih 28 hari : P(Wh≥28) =>

Z=

28 − 26 2 = = 0.81 2.47 6.11

Dari tabel Daerah Kurva Normal untuk Z = 0.81 --> diperoleh P = 0.291 Jadi P(Wh≥28) = 29.1%

0.81 Y =26 hari

Y+2 = 28

0 5 3 6 7 7 11 14 13 20 24

Total Float

Keterangan

LF (LF - EF)

3 7 7 14 11 13 14 20 20 24 26

0 2 0 3 2 0 2 2 0 0 0

jalur kritis jalur kritis jalur kritis jalur kritis jalur kritis jalur kritis

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