Question: Random digit dialing. Most sample surveys use random digit dialing equipment to call residential telephone numbers at random. The telephonepolling firm Zogby International reports that

Random digit dialing. Most sample surveys use random digit dialing equipment to call residential telephone numbers at random. The telephonepolling firm Zogby International reports that the probability that a call reaches a live person is 0.2.9 Calls are independent.

(a) A polling firm places 5 calls. What is the probability that none of them reaches a person?

(b) When calls are made to New York City, the probability of reaching a person is only 0.08. What is the probability that none of 5 calls made to New York City reaches a person?

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