A large chain retailer purchases a certain kind of electronic device from a manufacturer. The manufacturer indicates tha

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answerhappygod
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A large chain retailer purchases a certain kind of electronic device from a manufacturer. The manufacturer indicates tha

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A large chain retailer purchases a certain kind of electronic
device from a manufacturer. The manufacturer indicates that the
defective rate of the device is 3%.
a) The inspector randomly picks 20 items from a shipment.
What is the probability that there will be at least one defective
item among these 20?
b) Suppose that the retailer receives 10 shipments in a
month and the inspector randomly tests 20 devices per shipment.
What is the probability that there will be exactly 3 shipments each
containing at least one defective device among the 20 that are
selected and tested from the shipment?
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