(Answered) Submitted for service while under warranty

Statistics

Problem: Twenty-five 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.

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Question: If a company purchases ten of these telephones, what is the probability that exactly two will end up being replaced under warranty? Please show step by step details and formulas.

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