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OpenStudy (anonymous):
A quality-control center finds that 2 out of 250 toy trains are defective. How many trains would they expect to be defective in a batch of 10,000?
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OpenStudy (anonymous):
probability of gettin defect items=2/250=0.008 out of 10,000 items, expected defect items=0.008 x 10000=80
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