Chapter 4 - Probability and Counting Rules - 4-3 The Multiplication Rules and Conditional Probability - Exercises 4-3 - Page 223: 18

0.116

Model I accounts for 80% and 10% are defective, hence: P(Model-I is defective) = 0.8 x 0.1 = 0.08 Model II accounts for 20% and 18% are defective, hence: P(Model-I is defective) = 0.2 x 0.18 = 0.036 P(Any of the items is defective) = 0.08 + 0.036 = 0.116