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21 November, 12:48

Most sample surveys use random digit dialing equipment to call residential telephone numbers at random. the telephone polling firm zogby international reports that the probability that a call reaches a live person is 0.15. calls are independent. (a) a polling firm places 7 calls. what is the probability that none of them reaches a person?

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  1. 21 November, 13:20
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    The probability is 0.3206.

    Since the probability of reaching a live person is 0.15, the probability of not reaching someone is 1-0.15=0.85.

    The probabilities are independent, which means to find the probability of not reaching anyone on all calls we find (0.85) ^7 = 0.3206.
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