before their guarantee has expired, what is the probability that a merchant who has sold 100 such tubes will be forced to replace at least 20 of them?...
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If 10% of television picture tubes burn out before their guarantee has expired,


what is the

probability that a merchant who has sold 100 such tubes will be forced to


replace at least 20 of them?. What is the probability he will replace at least 5 and not


more than 15?

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