Questions 15-18) Telephone survey. A telephone survey uses a random digit dialing machine to call subjects. The random digit dialing machine is expected to reach a live person 15% of the time. Question 15. In eight attempts, what is the probability of achieving exactly two successful calls? A. 0.0085 B. 0.1275 C. 0.2376 Question 16. What is the probability of two or fewer successful calls in eight attempts? A. 0.2376 B. 0.5643 C. 0.7687               D. 0.8948 Question 17. What is the expected value for the number of contacts in eight attempts? A. 0.1275 B. 0.9099 C. 1.2000 Question 18. What is the variance for the number of contacts in eight attempts? A. 0.1500 B. 1.0200 C. 1.2000

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