Sampled before the ?rst defective item

Reference no: EM13982697

Ten percent of the items produced at a plant are defective. A random sample of 20 items is selected. What is the probability that more than three items in the sample are defective? If items are selected randomly until the ?rst defective item is encountered, how many items, on average, will have to be sampled before the ?rst defective item is found?

Reference no: EM13982697

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