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8. The principle of redundancy is used when system reliability is improved through redundant or backup components. Assume that a student's alarm clock has a 15.4% daily failure rate. Complete parts (a) through (d) below. a. What is the probability that the student's alarm clock will not work on the morning of an important final exam? (Round to three decimal places as needed.) b. If the student has two such alarm clocks, what is the probability that they both fail on the morning of an important final exam? (Round to five decimal places as needed.) c. What is the probability of not being awakened if the student uses three independent alarm clocks? (Round to five decimal places as needed.) d. Do the second and third alarm clocks result in greatly improved reliability? A. No, because the malfunction of both is equally or more likely than the malfunction of one. OB. No, because total malfunction would still not be unlikely. OC. Yes, because total malfunction would not be impossible, but it would be unlikely. D. Yes, because you can always be certain that at least one alarm clock will work. 9. Based on a poll, 64% of Internet users are more careful about personal information when using a public Wi-Fi hotspot. What is the probability that among four randomly selected Internet users, at least one is more careful about personal information when using a public Wi-Fi hotspot? How is the result affected by the additional information that the survey subjects volunteered to respond? The probability that at least one of them is careful about personal information is (Round to three decimal places as needed.) How is the result affected by the additional information that the survey subjects volunteered to respond? O A. It is very possible that the result is not valid because not everyone uses public Wi-Fi. O B. It is very possible that the result is not valid because the sample may not be representative of the people who use public Wi-Fi. C. The result should not be impacted by this because there is no reason to lie when responding. OD. The result should not be impacted by this because volunteers are likely to have the most relevant responses