Historically, 2% of the parts from A1 are defective, and 5% of the parts from A2 are defective.

Historically, 2% of the parts from A1 are defective, and 5% of the parts from A2 are defective.

Events: Good part (G), defective part (B)

Thus:

P(G|A1) = .98 P(B|A1) = .02

P(G|A2) = .95 P(B|A2) = .05

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