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Refer to the image and answer the following questions. What is the probability that exactly four telephone lines are busy in a day? What is
Refer to the image and answer the following questions.
- What is the probability that exactly four telephone lines are busy in a day?
- What is the probability that, at least three telephone lines busy in a day?
- What is the probability that the number of busy telephone lines in a day is at least two but at most four?
- What is the probability that at least one telephone line is busy in a day?
- What is the expected value and variance? Interpret your answer.
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