The following table shows the marks of 90 students in a test of 80 marks: Marks Number of Students 1 – 10 5 11 – 20 8 21 – 30 10 31 – 40 13 41 – 50 18 51 – 60 17 61 – 70 12 71 – 80 7 The percentage of students who have obtained less then or equal to 50% marks is
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