Ask Question
10 November, 12:31

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?

+3
Answers (1)
  1. 10 November, 12:52
    0
    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.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question 👍 “Most sample surveys use random digit dialing equipment to call residential telephone numbers at random. the telephone polling firm zogby ...” in 📗 Mathematics if the answers seem to be not correct or there’s no answer. Try a smart search to find answers to similar questions.
Search for Other Answers