A) In the sample of 10 student scores 100, 105, 91, 52, 116, 100, 95, 98, 109, 96, clearly there is at least 1 student who failed the exam. What is the estimated proportion of fail scores from these 10 scores? Note: If you are less than 60%, i.e. less than 72 points out of 120, you are considered failed.
B) What is the maximum margin of error for the estimate of proportions in this case? Assume normality and use 90% confidence level.
C) Assuming normality, compute 90% confidence interval for true proportions of failed students.
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