If 10% of the television picture tubes burn out before their guarantees has expired: (a) What is the probability that a merchant who has sold 100 such tubes will be forced to replace 20 of them?
(b) What is the probability that he will replace at least 5 and not more than 15 tubes?

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Kriszzznizzle

23.07.2022

Mathematics

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If 10% of the television picture tubes burn out before their guarantees has expired: (a) What is the probability that a merchant who has sold 100 such tubes will be forced to replace 20 of them? (b) What is the probability that he will replace at least 5 and not more than 15 tubes?