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QUESTION B1 A study of corruption for a certain geographic region showed an average of 5 corruptions occur per 20,000 people. In a city of 80,000 people, find the probability that at least 3 corruptions occur. QUESTION B2 (a) A random sample of 300 students from a geographic area indicated that 45 students attended private school. Estimate the true proportion of students attending private schools with 95% confidence. (b) A survey of 25 individuals who passed the ACCA exam showed that average annual salary is RM150,000 and standard deviation RM15,000. (i) Find the degrees of freedom. (ii) Construct 99% confidence interval for the true average salary.
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