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13. A fair six-sided die is rolled twice. What is the probability that a six is observed on the second toss and a four is observed on the first toss. (b) 0 as these are independent exclusive events. (d) 0 as these are mutually exclusive events. 14. The graduate placement office believes that the probability that a Bachelor of Commerce student will land a job shortly after graduating is 0.8. They selected a random sample of 40 of last years graduates and checked their em- ployment status. How many of these graduates should they expect to have not landed a job? (a) 20. (b) 40. (c) 8. (d) 32 15. Researchers asked a random sample of students who live off campus how much they spend on rent for a two bedroom apartments in Makhanda. They found the sample mean is R7 200 per month. Using a two-tailed test, they reject Ho: - R6 800 at the 5% significance level. Which of the following could be a 95% confidence interval for the mean, the average rent for two bedroom apartments in Makhanda? a) 6 900 -7 500 (b) Not enough information is given to answer this question. (c) 6 800 -7 600. (d) 7 000 7 300