Telehpne telemarketers and opinon polls use random digit dialing equipment to ca

Question

Telehpne telemarketers and opinon polls use random digit dialing equipment to call residential telephone calls at random. The telephone polling firm X reports that the probability that a call reeaches a live person is 0.2. Calls are independent.

a) telemarket 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 perso is only 0.08. What is the probability that none of 5 calls made to New York City reaches a person?

Explanation / Answer

a) (0.8)^5 = 0.32768 b) (0.92)^5 = 0.65908

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