Probability more than three items in sample are defective

Reference no: EM131370981

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 first defective item is encountered, how many items, on average, will have to be sampled before the first defective item is found?

Reference no: EM131370981

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