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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28-02-2018
Mathematics

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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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MsEHolt MsEHolt · Answer 1 · 2018-03-13T01:45:39+01:00

MsEHolt MsEHolt

13-03-2018

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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