Most sample surveys use random digit dialing equipment to, Basic Statistics

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Most sample surveys use random digit dialing equipment to

Random digit dialing

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

(a) A polling ?rm 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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