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historically, 10% of a large shipment of machine parts are defective. If a random sample of 400 parts is selected without replacement from a shipment

historically, 10% of a large shipment of machine parts are defective. If a random sample of 400 parts is selected without replacement from a shipment that included 5000 machine parts, what is the probability that the sample will have

a. between 9% and 10% defective parts?

b. less than 8% defective parts?

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