Twenty percent of all telephones of a certain type

By Allen Kazadi

Twenty percent of all telephones of a certain type are submitted for service while under warranty. Of these, 60% can be repaired, whereas the other 40% must be replaced with new units. If a company purchases ten of these telephones, what is the probability that exactly four will end up being replaced under warranty

Answer:

0.0052 = 0.52% probability that exactly four will end up being replaced under warranty.

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