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In: Statistics and Probability

Six chapters are sitting on an editor’s desk that must be typed and proofed as soon...

Six chapters are sitting on an editor’s desk that must be typed and proofed as soon as possible. The chapters need to be typed first then proofed. Some chapters are easy to type but more difficult to proof. The estimated time (in minutes) for each activity is shown in the table below.


Chpt

Typing

Proofing

1

30

20

2

90

25

3

60

15

4

45

30

5

6

75

20

60

30

According to Johnsons rule, what would be the sequence of chapters that will minimize the total

completion time and what is the minimum completion time for these six chapters in minutes?

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