Circuit Boards for Wireless Telephones Are Etched, in an Acid

question 13

Multiple Choice

Circuit boards for wireless telephones are etched, in an acid bath, in batches of 100 boards.A sample of seven boards is randomly selected from each lot for inspection.A particular batch contains two defective boards; and x is the number of defective boards in the sample.P(x=2) is _______.

• A)0.1315
• B)0.8642
• C)0.0042
• D)0.6134
• E)0.0034