Mean and the variance of the number of defective bulbs


A company produces light bulbs of which 2% are defective. (a) If 50 bulbs are selected for testing, what is the probability that exactly 2 are defective? (b) If a distributor gets a shipment of 1,000 bulbs, what are the mean and the variance of the number of defective bulbs?

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Basic Statistics: Mean and the variance of the number of defective bulbs
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