Every time a machine breaks down at the Dynaco Manufacturing Company (Problem A), either 1, 2, or 3 hours are required to fix it, according to the following probability distribution:
|
Repair Time (hr.)
|
Probability
|
|
1
|
.30
|
|
2
|
.50
|
|
3
|
.20
|
|
|
1.00
|
The Dynaco Manufacturing Company produces a product in a process consisting of operations of five machines. The probability distribution of the number of machines that will break down in a week follows:
|
Machine Breakdowns per Week
|
Probability
|
|
0
|
.10
|
|
1
|
.10
|
|
2
|
.20
|
|
3
|
.25
|
|
4
|
.30
|
|
5
|
.05
|
|
|
1.00
|
Question: The Dynaco Company is considering a preventive maintenance program that would alter the probabilities of machine breakdowns per week as shown in the following table:
|
Machine Breakdowns per Week
|
Probability
|
|
0
|
.20
|
|
1
|
.30
|
|
2
|
.20
|
|
3
|
.15
|
|
4
|
.10
|
|
5
|
.05
|
|
|
1.00
|