Question

10. A tennis player estimates that her serves are good 75% of the time. If she serves 12 ti mes, what is the probability that at least 7 of them are good? A. 0.0544 B. 0.1576 C. 0.9456 D. 0.8423 11. Carbon monoxide (CO) emissions for a certain kind of car follow a normal distribution and have a mean of 2.9 g/mi and standard deviation 0.4 g/mi. A company has 40 of these cars in its fleet. What is the probability that the average CO level for the sample of 40 cars is at least 3.0 g/mi? A. 0.0571 B. 0.9429 C. 0.4013 D. 0.5987 12. A bag contains 4 red marbles and 7 blue marbles. Two marbles are drawn from the bag, without replacement. Let X - the number of red marbles selected. What is the probability that you draw one red marble [P(X-1)]? A. 0.2545 B. 0.16 c. 0.5091 D. 0.4628 13. Suppose we took a random sample of 300 students and ask if they preferred morning evening, or night classes. If 81 students preferred morning classes what is the 95% CI for the proportion of students who prefer morning classes? (Round to two decimal points) A. (0.27, 0.03) B. (0.19, 0.35) C. (0.22, 0.32) D. None of these Use the following for questions 14-17: One student is selected at random from a group of 200 known to consist of 140 full-time (80 female and 60 male) students and 60 part-time (40 female and 20 male) students. Let A be the event "the student selected is full-time," and let C be the event "the student selected is female." 14. Fill in the four areas of the Venn Diagram below

Answer 1

dt be the nurbtr So, Gin (12,o-75) ニ.l _ o.gy2g = 0.0591.

please ask the other two questions separately.