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7. The examination results of 5000 students are analyzed and the following percentiles are calculated: Pio = 30 PAn = 45 P50 = 60 P30

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7. The examination results of 5000 students are analyzed and the following percentiles are calculated: Pio = 30 PAn = 45 P50 = 60 P30 = 81 a) Approximately what percentage of students scored 45 or less? (2 marks) b) What is the median mark for this exam? (2 marks) c) Approximately, how many students scored more than 81? (2 marks)

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