Electric circuit boards are rated excellent, acceptable, or unacceptable. Suppose that 30% of boards are excellent, 60% are acceptable, and 10% are unacceptable. Further, suppose that 10% of excellent boards fail, 20% of acceptable boards fail and 90% of unacceptable boards fail. (a) What is the probability that a board fails? (b) Given that a board fails, what is the probability that it was rated excellent?

A First Course in Probability (10th Edition)
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ISBN:9780134753119
Author:Sheldon Ross
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Chapter1: Combinatorial Analysis
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Electric circuit boards are rated excellent, acceptable, or unacceptable. Suppose that 30% of boards
are excellent, 60% are acceptable, and 10% are unacceptable. Further, suppose that 10% of excellent
boards fail, 20% of acceptable boards fail and 90% of unacceptable boards fail.
(a) What is the probability that a board fails?
(b) Given that a board fails, what is the probability that it was rated excellent?
Transcribed Image Text:Electric circuit boards are rated excellent, acceptable, or unacceptable. Suppose that 30% of boards are excellent, 60% are acceptable, and 10% are unacceptable. Further, suppose that 10% of excellent boards fail, 20% of acceptable boards fail and 90% of unacceptable boards fail. (a) What is the probability that a board fails? (b) Given that a board fails, what is the probability that it was rated excellent?
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