Question: A quality control manager estimates that a batch of items contains 15% defectives. A sample of eight items is taken at random from the batch.

A quality control manager estimates that a batch of items contains 15% defectives. A sample of eight items is taken at random from the batch. Using Excel’s binomial distribution function BINOMDIST, find the probability that the sample contains (i) one defective (ii) two or more defectives.

(Answers: (i) probability of one defective is 0.3847 (ii) probability of two or more defectives is 0.3428.)

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