Probability Methods for Cost Uncertainty Analysis, 2nd Edition

36 Probability Methods for Cost Uncertainty Analysis

c. The rst chip is defective and the second chip is nondefective.

d. The rst chip is nondefective and the second chip is defective.

2.18 Suppose the sampling scheme in Exercise 2.17 was with replacement;

that is, the rst chip is returned to the lot before the second chip

is drawn. Show how the probabilities computed in Exercise 2.17 are

changed.

2.19 Spare power supply units for a communications terminal are provided

to the government from three different suppliers A

1

, A

2

,andA

3

. Thirty

percent come from A

1

, 20% come from A

2

, and 50% come from A

3

.

Suppose ...