Human visual inspection of solder joints on printed circuitboards can be very
Chapter 2, Problem 19(choose chapter or problem)
Human visual inspection of solder joints on printed circuitboards can be very subjective. Part of the problem stemsfrom the numerous types of solder defects (e.g., pad nonwetting,knee visibility, voids) and even the degree towhich a joint possesses one or more of these defects.Consequently, even highly trained inspectors can disagreeon the disposition of a particular joint. In one batch of10,000 joints, inspector A found 724 that were judgeddefective, inspector B found 751 such joints, and 1159 ofthe joints were judged defective by at least one of theinspectors. Suppose that one of the 10,000 joints is randomlyselected.a. What is the probability that the selected joint was judgedto be defective by neither of the two inspectors?b. What is the probability that the selected joint wasjudged to be defective by inspector B but not byinspector A?
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