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Which of the following has a binomial distribution a

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8. Which of the following has a Binomial distribution? a. The number of people against the smoking ban out of a sample of 100. b. The number of telephone calls received by a switchboard in a specified time period c. The number of customers arriving at a gas station in Christmas day d. All of the above are Binomial. 9. One out of four of the students in an English class is an international student. Take a random sample of 100 students from this class. The standard deviation is: Suppose 30% of OSU students watch American Idol every week. Two OSU students are selected at random. 10. What is the probability that both of them watch American Idol every week?
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11. What is the probability that neither of them watches American Idol every week? 12. What is the probability that at least one of them watches American Idol every week? 13. A multiple-choice test has 25 questions. There are 4 choices for each question. A student who has not studied for the test decides to answer all questions randomly. What is the expected number of correct answers if you guess on all the problems? 14. Suppose you flip a fair coin 7 times, and let X be the total number of tails. What is the probability that X is greater than 1?
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