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​Q15: Answers – Paper 5 – November 2018
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15) The cumulative frequency graph shows information about the marks scored by a group of 80 students in a test.
a) Find the interquartile range.
[2 marks]

​b) The ratio of the number of students passing the test compared to failing the test is 4 : 1.
​Find the minimum mark needed to pass the test.
[3 marks]